New PDF release: Biology and Comparative Physiology of Birds. Volume I
By A. J. Marshall
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Additional resources for Biology and Comparative Physiology of Birds. Volume I
F r i e d m a n n , H . (1955). T h e h o n e y - g u i d e s .
R . , a n d Cade, T . J . (1957). T o r p i d i t y in t h e W h i t e t h r o a t e d Swift, A n n a H u m m i n g b i r d , a n d Poor-will. Condor 5 9 : 1 4 5 - 1 5 5 . 54 R O B E R T W . STORER Beecher, W . J . (1951a). A d a p t a t i o n s for food-getting in t h e A m e r i c a n blackbirds. Auk 6 8 : 4 1 1 - 4 4 0 . Beecher, W . J . (1951b). Convergence i n t h e Coerebidae. Wilson Bull. 6 3 : 2 7 4 - 2 8 7 . Berger, A . J . (1952). T h e c o m p a r a t i v e functional m o r p h o l o g y of t h e pelvic a p p e n d a g e in three genera of Cuculidae.
6 Simplified diagram s h o w i n g h o w b e n d i n g of t h e ankle joint of a perching bird a u t o m a t i c a l l y causes flexion of t h e t o e s . II. ADAPTIVE RADIATION IN BIRDS 27 is a very simple mechanism for keeping the birds' toes clamped around the branch on which they perch (Fig. 6). The tendons for the flexor muscles of the toes pass around behind the ankle joint so t h a t when the bird stands up straight the toes can be extended but when the bird bends the ankle joint, as it must when crouched on a perch, these tendons are under constant tension and automatically keep the toes flexed around the branch.
Biology and Comparative Physiology of Birds. Volume I by A. J. Marshall