Most birds are digitigrade animals, which means that they walk on their toes, not
the entire foot. Some of their lower bones of the foot ...
Down Feathers - These keep both young and old birds warm. ... Muscular-
Skeletal, A bird has an internal skeleton with two pairs of limbs attached to the
Though a bird's major limb bones are hollow with internal struts for support, this
makes them stronger not lighter; a bird's leg bones for example are often heavier
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... Their forelimbs have become modified into wings for flying. All modern birds ...
Feb 10, 2011 ... New research shows how the digits in a bird's wing shift during ... dinosaurs,
evolved from an ancestor that had five digits at the end of its limbs.
Birds are 'warm-blooded' vertebrates, with fore-limbs modified to wings, and skins
covered with feathers. Vertebrates are characterised by having a spinal ...
Mar 14, 2013 ... Look at the leg of almost any bird and you'll see feathers covering the thigh but
scales covering everything from the 'knee' downwards.
Birds' legs have an adaptation called "rete mirabile" that minimizes heat loss. The
arteries that transport warm blood into the legs lie in contact with the veins that ...
Mar 14, 2013 ... Instead of two wings, the first birds might have used four feathered limbs to stay
aloft, according to research published today in Science.
Comprehensive list of synonyms for parts of birds, by Macmillan Dictionary and
Thesaurus. ... spur. noun. a sharp curved part on the back of a bird's leg ...