Our website services, tools, and content is for informational purposes only. Tian, [8], There are also groups like the Himba in Namibia, who have an opposite set of preferences. West was known for his extremely quick jump shot, and when coupled with his length, it formed one of the deadliest jump shots in NBA history. So the question is, what is the mechanism of propulsion of your dragon? (Grades 3-7) These birds are among the largest flying birds on Earth and are famously known for their truly massive wingspans. If a dragon could fly without magical assistance, how much force could a dragon exert in directed air attacks using the force of its wings? As a rule, small birds have lower ratios - the common ruby-throated hummingbird has a ratio of .025 oz/in, while most large birds are over 1.0 (some as high as 5). Da Vinci and the Divine Proportion in Art Composition. If the height is 57 (67 inches) and the wingspan is 70 inches, the ape index will be +3. T. Nakata, For all intents and purposes, this power behaves like a caching effect that draws from your personal supply. So fearow would have a larger wingspan-heigh ratio than, say, pidgey. Anyway, I thought I should compare these human wings to my other wing data. Birds arose as warm-blooded, arboreal, flying creatures with forelimbs adapted for flight and hind limbs for perching. This survey will open in a new tab and you can fill it out after your visit to the site. Example: Daniel Woods, arguably the greatest boulderer of all time, is 5 8 (68 in) with a 72-inch wingspan. Underneath thousands of feet of Thwaites Glaciers solid ice, a bot filmed peculiar features, where melting is much faster. The Great bustard, for instance, is the heaviest flying bird in the world. The Secret to Bruce Lees Superhuman One-Inch Punch. R. Xu, Diffusion models generate incredible images by learning to reverse the process that, among other things, causes ink to spread through water. All rights reserved. LegLengtheningSurgery.com does not provide medical advice, diagnosis, or treatment. Tristan albatross: Tristan albatross also belong to the same family like wandering albatross. 19H02060, JSPS. Accuracy is within inch total span. An example of a human body ratio is a person's arm spanthe distance from the left hand's middle fingertip to the right hand's middle fingertip when stretching out both . Aspect ratio: 6.48. Wingspan-to-height or arm-to-body ratio (ABR) is one way to check if your body is proportional. Wingspan is the distance between wingtips when the wings are held outstretched. WIRED is where tomorrow is realized. Unmotorized? That would be a big bird (not Big Bird). T. Nakata, The high-tech wing on the A350 XWB improves aerodynamic . Shoebill. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can airtags be tracked from an iMac desktop, with no iPhone? Regardless, they average out to about the same in size in wingspan. (C) . They then lock their wings in place through a special biological mechanism and cruise in the clouds. Y. Chen, Male Great Horned Owl. The aspect ratio is then simply calculated as the wing span squared, divided by the wing area. The wandering albatross often has wingspans reaching 11 feet in length, with some occasionally reaching 12 feet. The golden ratio is a mathematical miracle thats abundant in nature. bird wingspan to body ratio. T. Nakata, and The dragon is 20 foot long and weighs 6 tonnes. So a dragon would need much larger wings if it needs to be able to take off without a running start or jumping from a high place. Conventionally attractive people are also understood to be more sociable, dominant, sexually warm, mentally healthy, intelligent, and socially skilled than others. K. Kawachi, T. Nakata, Worldbuilding Stack Exchange is a question and answer site for writers/artists using science, geography and culture to construct imaginary worlds and settings. Albatrosses fly by swooping towards the water and pulling up, catching updrafts, and racing back up. P. Chirarattananon, 1. Categories . 1. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. . A high aspect ratio indicates long, narrow wings. J. Sheridan, I always like to end by saying something. What is the shape of the dragon? And also like to know this ratio in birds, if there are information about? Human proportions and ratios have a range of deviation, but 9/10 times most people wont notice if you have short arms unless its far outside average. J. Zhao, Most "When Activated" powers (brown . That sounds about right. Femur-to-tibia is an intra-limb ratio that has at least a slight impact on perceived attractiveness as well.[2]. S. Ravi, They are middle-sized albatrosses when compared to the other species and are also only recently distinguished as genera. https://www.scientificamerican.com/article/human-body-ratios/, [4] Wingspan to body height ratio. As part of this activity, students visit the PowerPlay exhibit at the Children's Museum of Houston. Aviation Stack Exchange is a question and answer site for aircraft pilots, mechanics, and enthusiasts. He considered this figure the ideal man who was healthy and physically fit. What are (wing area)/(weight) ratio in birds and airplanes? Obviously, it is the best ape index all over the world at the moment. Did I actually say that? There are often evolutionary advantages to seemingly strange body parts and the albatross is no different. Everything but a swallow, African, European, or otherwise, laden with a coconut or not. Swallows are mentioned in pages 15 and 24 of the reference "A Cessna 172S, which is a fairly recent airplane" The -S may get a pass (1998), somebody but calling the 172 airframe recent makes me reach for my wooden stake and silver cross :). Regarding creatures with more legs than two (dogs, dragons, horses, griffins etc). Archives of Sexual Behavior, 45(4), 901-910. https://pubmed.ncbi.nlm.nih.gov/26474977/, [9] Sorowkoski, P. (2012). The measurements of the lengths of specific parts and the weights of birds varies between species, populations within species, between the sexes and depending on age and condition. And what about the mass? . The bad part is that they eat jet fuel. [6] Women, on the other hand, benefit from a higher LBR. bird wingspan to body ratio port deposit, md real estate. Wing loading for birds is generally between 1 to 20 kg/m 2. The wing width can also be measured from the carpal joint to the tip of the first secondary feather.[9]. These sea birds glide over the ocean with a wingspan of up to almost 11 feet (3.35 meters), . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The wingspan of an albatross regularly clears 10 feet, with some species averaging out around 11-12 feet in length. Perceived attractiveness leads to a halo effect, leading attractive people to be seen as kinder, better, and more capable than the rest regardless of their abilities. H. C. Park, , Relationship between wingbeat frequency and resonant frequency of the wing in insects, The aerodynamics of hovering insect flight. When expressed as a ratio, Woods has an ape index of 1.06. How to calculate: Wingspan / Height. This is normally measured in feet. Measuring the distance between the thigh joint and the ankle gives the leg length, and dividing this length by the total height of a person results in the LBR. Tatum, at 6 8 tall, has a fairly typical height to wingspan ratio for an NBA player. The average LBR is 0.529 for both men and women when measured from groin to base of the foot. However, due to its variability with seasons and body condition, it is not recommended to be used as an indicator of body size. $$ A = \frac{L}{0.5 v^2 \rho C_L} $$. (2018). This can however vary with the handling and can depend on the age and state of shrinkage in the case of measurements taken from preserved skins in bird collections. As an Amazon Associate I earn from qualifying purchases. This means they go slower unless they have extra power to counteract the drag. Does a summoned creature play immediately after being summoned by a ready action? https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5990728/, [3] Science Buddies & De Brabandere, S. (2017, March 16). Usually, people think of legs and arms measuring closer to the average more attractive, while they see those that differ vastly as unattractive. Wood, , Controlled flight of a biologically inspired, insect-scale robot, A. J. Bergou, I love birds and biology, but I'm horrible at using the right keywords when I look for information. K. Hourigan, and Hence, if the wingspan is longer than height, the ape index will be greater than 1. Aspect ratio = wing length (m)/wing width (m) Generally, high aspect ratio wings give slightly more lift and enable sustained, endurance flight, while low aspect ratio wings are best for swift manoeuvrability. M. Farge, Styling contours by colour and by line thickness in QGIS, Redoing the align environment with a specific formatting, Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? Picture this: an ancient bird with a 24-foot wingspan soaring over the ocean. Flapping just increases the factor "V" by the speed you move the wing. rev2023.3.3.43278. Actually, it makes the data look a little better. Also, he just kind of flew. From Wikipedia. Scientists Identify 3 Reasons Why Attractive People Make More Money. Let me look at a whole bunch of birds and see if there is a correlation between mass and wingspan. Contact the AZ Animals editorial team. This is important because a bird should be able to totally extend its wings (in the cage) and flap them vigorously for exercise. C.-K. Kang, Is there a proper earth ground point in this switch box? @CrossRoads The C172S is still in production. Even within the species, however, there are some that are larger than the others. S. M. Walker, , Smart wing rotation and trailing-edge vortices enable high frequency mosquito flight, S. N. Fry, Have some feedback for us? Z. Feng, and The largest flying bird by wingspan is the wandering albatross. acknowledges the financial support from the Japanese Government MEXT scholarship. These different species can be broken up into four genera (the grouping above a species): great albatrosses, mollymawks, North Pacific albatrosses, and sooty albatrosses. Most of the entries in the NAME column of the output from lsof +D /tmp do not begin with /tmp. For example, if a person with 150 Lbs wants to fly, how much should be the least area of his wings? Fearow is based off the anhinga, which wikipedia tells me is "35 in (88.9 cm) in length with a 45 in (1.14 m) wingspan.". How wide and long would the wings need to be for it to fly? Bird Quiz - 13,711 People Couldn't Ace This Quiz, Watch a Bald Eagle Harass and Dive Bomb an Adult Grizzly, Tiny Crab Nearly Drowns a Large Bald Eagle in Impressive Fight, Meet One of the Smartest (and Naughtiest) Birds On Earth, Watch an Eagle Attack A Trespassing RC Glider In Their Territory. Men, meanwhile, are preferred if they have relatively higher LBRs than average. All measurement is prone to error, both systematic and random. Then 13.6 inch x 3 inch = 40.8 square inches, or 0.28 sq ft. In todays image-focused and social media-driven world, having a proportionate body has become more and more desired, especially in the leg lengthening community. Styling contours by colour and by line thickness in QGIS. [11] Even if youve already had your femur lengthened, you may be highly bothered if you think your legs look disproportionate. The definition of the length of the tail can vary when some of them have elongations, forking or other modifications. Want to improve this question? If you continue to use this site we will assume that you are happy with it. In some cases, a wingspan of about 9 meters (~30 feet) would be needed, especially for carrying a heavy load. Welcome to the site Harvey, please take the, Depends on how fast it can fly in a straight line. In most cases, this is going to be a comparison results in a ratio of 1:1.618. Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Big birds tend to glide more. Where $A$ is the area of the wing, $L$ is the mass of the dragon, $v$ is the velocity that the dragon needs to achieve flight, $\rho$ is the density of air, and $C_L$ is the lift coefficient (usually close to 1 for most flying creatures). X. Deng, , Wingbeat time and the scaling of passive rotational damping in flapping flight, Translational and rotational damping of flapping flight and its dynamics and stability at hovering, Simulation-based insect-inspired flight systems, H. Liu, How big would a dragon's wings need to be? K. Schneider, The wing is usually measured from the carpal joint (the bend of the wing) to the tip of the longest primary feathers. Surgery | Written by Joshua Leaf | Updated on January 28, 2022. How heavy are modern cantilever monoplane wings? For example, if both wingspan and height are 180 cm, the ape index will be 180/180, which is 1. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Latest model? Manute Bol Wingspan. https://www.theguardian.com/science/2008/jan/17/humanbehaviour.psychology, [7] Baer, D. (2014, November 10). * 'Wing Loading' shows the differences between birds with similar wing shapes but different sizes. Length: 18-26". ). A versatile, integrated computational model of hovering flight that couples flapping-wing-and-body aerodynamics and three degree of freedom body dynamics was employed to analyze free-flight body dynamics, flapping aerodynamics, and power cost for three typical insects of a fruit fly, a bumblebee, and a hawkmoth over a wide range of Reynolds numbers (. The WBMR and wing mass distribution can lead to large inertial forces and torques in fast-flapping wings, particularly in insect flights, comparable with or even greater than aerodynamic ones, which may greatly affect the aerodynamic performance, flight stability, and control, but still remain poorly understood. That is works out to 2.75 pounds per foot of wingspan. 0. Ratios compare two quantities, like the size of one part of the body to the size of another part, or to the size of the whole. The average person has a leg-to-body ratio between 1:1 to 1:1.5. Oh, you can find more details on their site at Human Bird Wings. 9. Can scalable design of wings for flapping wing micro air vehicle be inspired by natural flyers? 2023 Cond Nast. The total length of a bird is sometimes measured by putting a dead bird on its back and gently pressing the head so that the bill point to the tail tip can be measured. The equation we need is: Let me just say that I, for one, welcome our human bird winged overlords. This measurement is particularly prone to variation resulting from wing posture and is rarely used except as a rough indicator of size, but it is an important measurement for studies of bird flight. For example, high aspect ratio combined with low wing loading is used for slow flight such as gliding or soaring. When he isn't distracted by his backyard birdfeeder, you can find him camping, exploring, and telling everyone around him about what he's recently learned. Well, Cessna is still making them, and folks & schools are still buying them. More than a decade of eyewitness data shows that fainter stars disappear as artificial light brightens the night sky. Pelagornis sandersi was an ancient marine bird with a wingspan nearly twice as large as anything living today. N. Phillips, and Aerodynamic performance of a hovering hawkmoth with flexible wings: A computational approach, Effect of wing inertia on hovering performance of flexible flapping wings, N. S. Ha, Where does this (supposedly) Gibson quote come from? I. Okada, and Different surgeons will have different ways of assessing which bones to extend, though. A 1977 Cessn 150, 2 seat trainer, has a wing loading of 10 Lbs/Sq ft. Or, 0.1 sq ft/lb. Are Ratio & Proportion Preferences Universal? The other competitor for the worlds largest flying bird is the Southern royal albatross. How Old Are You, Really? New Tests Want to Tell You. When measuring wingspan: Albatrosses make up 5 of the 9 largest flying birds in the world! Selecting this option will search all publications across the Scitation platform, Selecting this option will search all publications for the Publisher/Society in context, The Journal of the Acoustical Society of America, Shanghai Jiao Tong University and Chiba University International Cooperative Research Center (SJTU-CU ICRC), Graduate School of Engineering, Chiba University, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, https://doi.org/10.1088/1748-3182/8/4/046008, https://doi.org/10.1016/j.compfluid.2019.04.007, https://doi.org/10.1088/1748-3182/4/1/015002, https://doi.org/10.1103/physreve.93.033124, https://doi.org/10.1016/j.paerosci.2010.01.001, https://doi.org/10.1016/j.compbiomed.2020.103817, https://doi.org/10.1016/0022-5193(83)90394-6, https://doi.org/10.1007/s10409-010-0389-5, https://doi.org/10.1016/j.jcp.2008.09.020, https://doi.org/10.1016/j.jfluidstructs.2019.03.021, https://doi.org/10.1016/j.jtbi.2010.11.022, https://doi.org/10.1007/s10409-007-0068-3, https://doi.org/10.1103/physreve.92.033004, https://doi.org/10.1016/j.cois.2020.10.001, https://doi.org/10.1007/s10409-017-0677-4, https://doi.org/10.1016/S0300-9629(96)00162-4, https://doi.org/10.1103/PhysRevLett.104.148101, Effects of wing-to-body mass ratio on insect flapping flights. A strong positive correlation . Royal Society Open Science, 5(5). Wingspan-to-height or arm-to-body ratio (ABR) is one way to check if your body is proportional. Curious Minds is a Government initiative jointly led by the Ministry of Business, Innovation and Employment, the Ministry of Education and the Office of the Prime Ministers Chief Science Advisor. D. Kolomenskiy, and 90-127 cm. Press question mark to learn the rest of the keyboard shortcuts, https://www.scielo.br/j/jatm/a/3WrcFMLN96KyHFDJjQpR85M/?lang=en, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5075716/. S. Donoughe, and The largest flying bird in history, argentavis magnificens, weighed about 200 pounds, and had a wingspan of about 7 meters (~23 feet). Who has the shortest wingspan in the world? In most cases the tarsus is held bent but in some cases the measurement may be made of the length of this bone as visible on the outer side of the bend to the base of the toes. Higher fuel consumption: Shorter wider-winged planes and birds have a bigger wing tip edge, which means more induced drag. With an estimated mass of 70-72 kg and a wingspan of 7 m, it was the world's largest known flying bird ( 1 - 10 ), about the size of a Cessna 152 light aircraft. Limb Lengthening Forum. The wingspan of an albatross is what allows it to go the distances required to breed, feed, and live. rev2023.3.3.43278. On the other hand, if the wingspan is 63 inches, the ape index will be -3. Note that this answer changes drastically with the velocity value, as the area is inversely proportional to the square of the velocity. Look at a hang glider for example. Larger wingspans of about 13.8 and 17 feet have been reported but they were not verified. Using this method, an albatross is able to travel 10,000 miles in a single journey a truly amazing ability. The wing length usually defined as the distance between the bend of the wing and the longest primary can also vary widely in some large birds which have a curved wing surface as well as curved primaries. Scientists have uncovered the Roman recipe for self-repairing cementwhich could massively reduce the carbon footprint of the material today. This measurement is however not suitable for use with living birds that have strong neck musculature such as the cormorants.[7]. N. Gao, Published 13 September 2011, Updated 16 February 2021. The largest specimens come in at 32 pounds with a wing and of 7.8 feet. J. Tong, A. P. Willmott, , A computational fluid dynamic study of hawkmoth hovering, The aerodynamics of revolving wings I. We can figure this out by exploring arm-to-body, leg-to-body, and intra-limb (upper-to-lower bone in the same limb) ratios. Even during the course of a day, the weight can vary by 5 to 10%. This measurement is particularly prone to variation resulting from wing posture and is rarely used except as a rough indicator of size, but it is an important measurement for studies of bird flight. Your dragon weights 12,000 pounds. The aspect ratio of a wing is important as generally the higher the aspect ratio (longer and narrower wings) the lower the induced drag produced by the wing at a given speed. T. Engels, If he is a 18-feet diameter sphere with extra 1 foot for head and tail each, it can fly without wings if it is full of any gas that is lighter than the surrounding air. Body length - 58-66 centimeters (22-26 inches) Weight - 700 grams-1.01 kilograms. These can often indicate variations more reliably. For reference, an albatross is able to travel the entire earth in a mere 46 days. How much surface area would a dragon's wings need to let it fly? And what about the mass? Where would this flying human machine fit in this plot? The Shoebill is also known as the whalehead or whale-headed stork for its enormous, shoe-shaped bill. These forces are reduced by streamlining the bird's body and wings. Despite the variations, measurements are routinely taken in the process of bird ringing and for other studies. That is works out to 8.4 pounds per foot of wingspan. Due to the sheer number of birds affected by the Australian wildfires, Stonemaier Games announced early that the next expansion for Wingspan will focus on the region of Oceania. [closed], hanggliding.org/wiki/Choosing_your_first_wing, cessna.txtav.com/en/piston/cessna-skyhawk#_model-top, We've added a "Necessary cookies only" option to the cookie consent popup. Wing shapes and sizes of both birds and planes determine how they might perform or what they might be capable of (for example, gliding, sustained high speed and manoeuvrability). However let's look at at wingspan to weight ratios of some of the largest know flying creatures. H. Liu, , The dynamics of passive feathering rotation in hovering flight of bumblebees, D. Kolomenskiy, New comments cannot be posted and votes cannot be cast. The lungs and heart would have to be enormous. Check out our bird wingspan selection for the very best in unique or custom, handmade pieces from our board games shops. Well, here is a human flying. The measurement is made by laying the bird on its back and flattening out the head and neck gently and measuring between the tip of the bill and the tip of the tail. On this Wikipedia the language links are at the top of the page across from the article title. 15-Plus Foods They Love! If you have questions or if you want to clarify on something that confuses you about any topic of biology, we are here to help. Nonetheless, the wingspan to height ratio and tibia-femur ratio are common concerns, but how exactly do other non-lengthens view these proportions, do most people have a preference and if so, is it a big deal? I need this ratio to estimate the wings size, if I want to create an aircraft to lift different weights(it's weight + load weight). The official maximum wingspan on record is 12.1 feet. Generally, they are much smaller, but they can get heavier than an albatross. Still, that isnt the whole story! Dot Physics blogger Rhett Allain shows why the numbers are so important. Dividing arm length by the person's height . Second, it looks like it would fit the trend of the other birds. I. Cohen, and Several times any real life example. The trade-off is that this type of plane wont be very manoeuvrable. If youre acutely self-conscious about your proportions or overall height, you may be suffering from height dysphoria. Learn more about us & read our affiliate disclosure. 10 Kevin Durant First: wow. This basic plan has become so modified during the course of evolution that in some forms it is difficult to recognize.. Wings are usually at least twice as long as they are wide, so something like $6.9\,$m$\times14.5\,$m would be about right. I don't know the powers (a and b) - oh and K is another constant. On average, this number tends to be 0. A semi realistic wingspan of 300 feet the size of a football field would require a figure of 40 pounds per foot. M. H. Dickinson, , The aerodynamics of hovering flight in Drosophila, Near- and far-field aerodynamics in insect hovering flight: An integrated computational study, The changes in power requirements and muscle efficiency during elevated force production in the fruit fly Drosophila melanogaster, D. Kolomenskiy, When we think of large birds, eagles, hawks, and condors are generally what come to mind. [9], The ratio of the femur to the tibia can play a part in making your legs look more aesthetically pleasing. Scientific American. The average ratio between the femur and the tibia is 0.743, and heterosexual women seem to find men with legs that come close to this average to be more physically desirable. https://www.businessinsider.in/strategy/scientists-identify-3-reasons-why-attractive-people-make-more-money/articleshow/45102751.cms, [8] Kiire, S. (2016). On the other hand, arm length is the distance between the ball of the shoulder and the wrist. Aside from flying birds, there are a few other species that are stuck on the ground that are significantly larger than an albatross. The best answers are voted up and rise to the top, Not the answer you're looking for? In the case where special structures such as racquets or streamers exist, these are separately measured. S. L. Buchmann, and Bird With Largest Wingspan - Wandering Albatross The "Wandering Albatross" has been declared as the bird with largest wingspan among all the living birds.Its wingspan on average ranges from 8.2 to 11.5 feet (2.51 to 3.50 meter).Larger wingspans of about 13.8 and 17 feet have been reported but they were not verified. The words ideal physique bring to mind the image of da Vincis Vitruvian Man a proportional body of a male figure that is perfectly inscribed within a square and a circle. It is the essential source of information and ideas that make sense of a world in constant transformation. The influence of leg-to-body ratio, arm-to-body ratio and intra-limb ratio on male human attractiveness. Among flying birds, the wandering albatross has the greatest wingspan, up to 3.5 metres (11.5 feet), and the trumpeter swan perhaps the greatest weight, 17 . The mollymawks are some of the most common albatrosses around. An extinct species of bird just discovered may have had the largest wingspan ever. C.-k. Kang, The average adult bald eagle has a wingspan of about 2.3 meters (7.5 feet). It is however useful in quantifying growth in laboratory conditions and for use in clinical diagnostics as an indicator of physiological conditions, and it is a fundamental quantity in bird aerodynamics. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Students practice estimating and measuring in metric units, and investigate the concepts of ratio and proportion as they relate to features of the human body. They can be rather imposing birds, standing at heights of 4 ft 5 inches, nearly that of a human. Aspect ratio is the ratio of wingspan to the mean of its chord (or the square of the . Published by at 07/06/2022. [5] However, this value might differ from country to country and ethnicity to ethnicity since anatomic proportions are mainly genetic. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. But there are unverified accounts of a wandering albatross with a wingspan potentially measuring 17 feet, 5 inches. The total body weight is an important biological measurement, usually used as a proxy for body mass. 1. 4B . Wingspan: 43-57". On the other hand, if the wingspan is 175 while the height is 170, the ape index will be 1.03. Z. J. Wang, , Fruit flies modulate passive wing pitching to generate in-flight turns, Muscle efficiency and elastic storage in the flight motor of Drosophila, This option allows users to search by Publication, Volume and Page.

Heart Touching Birthday Quotes For Son, Maundy Thursday Wishes For Priests, Articles B



bird wingspan to body ratio