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The arteries and veins intertwine in the legs, so heat can be transferred from arteries back to veins before reaching the feet. Such a mechanism is called countercurrent exchange . Gulls can open a shunt between these vessels, turning back the bloodstream above the foot, and constrict the vessels in the foot.
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Vocal Bird anatomy: Birds produce sounds through the air that passes through the Syrinx, which is shown close up in the bottom right. In order for birds to produce sound, they use an organ located above the lungs called the syrinx , which is composed of tracheal rings, syringeal muscles, Tympaniform membrane, and internal bony structures that ...
Bird template.gif: Nesusvet; derivative work: This drawing was created by Artem Topchiy (user Art-top). Other drawings see here .
External anatomy of a typical bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, 5 Mantle, 6 Lesser coverts, 7 Scapulars, 8 Coverts, 9 Tertials, 10 Rump, 11 Primaries, 12 Vent, 13 Thigh, 14 Tibio-tarsal articulation, 15 Tarsus, 16 Feet, 17 Tibia, 18 Belly, 19 Flanks, 20 Breast, 21 Throat, 22 Wattle, 23 Eyestripe Topography of a typical passerine.
Bird Tracks Are 60 Million Years Older Than Birds Gerard Soury - Getty Images. ... of Late Mesozoic archosaurs and firmly shows that the origin of bird-like foot morphology is at least ~210 ...
Birds have featured in culture and art since prehistoric times, when they were represented in early cave painting [312] and carvings. [313] Some birds have been perceived as monsters, including the mythological Roc and the Māori 's legendary Pouākai , a giant bird capable of snatching humans. [ 314 ]
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