The document outlines the external anatomy of birds, labeling various parts like the beak, head, iris, and feathers. It then discusses the evolution of birds from theropod dinosaurs around 150 million years ago. Modern birds are characterized by feathers, a beak without teeth, laying eggs, and a lightweight skeleton. While most birds have wings and can fly, the extinct moa was flightless. Many bird species migrate annually over long distances or make shorter irregular movements.

2. External anatomy of a bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, 5 Mantle, 6 Lesser coverts, 7
Scapulars, 8 Median coverts, 9 Tertials, 10 Rump, 11 Primaries, 12 Vent, 13 Thigh, 14
Tibio-tarsal articulation, 15 Tarsus, 16 Foot, 17 Tibia, 18 Belly, 19 Flanks, 20 Breast, 21
Throat, 22 Wattle, 23 Eyestripe

3. The fossil record indicates that birds emerged
within the theropod dinosaurs during the
jurassic period, around 150 millon years ago.

4. Modern birds are
characteristics by
fethers, a beak
with no teeth, the
laying of hardshelled eggs, and
a lightweight but
strong skeleton.

5. Extant birds have wings; the most recent
species without wings was the moa, wich is
generally cosidered to have become extinct in
the 16 th century wings are evolved forelimbs,
and most species can fly.

6. Many species annually migrate great distances,
and many more perform shorter irregular
movement.
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7. • ROGER, IKER, MARIA, ALBA,LUZ.