Question

Differences between w animals belonging to aves group and those in mammalia group

Answer 1

The differences between aves and mammals:
1.Aves have feathers, mammals don't.
2.Aves donot have hair while mammals do.
3.Aves are oviparous while mammals are viviparous, except for monotremes.
4.Aves have pneumatic hollow bones which make their entire skeleton light. Mammals don't.
5.Aves have beaks while mammals don't.
6.Aves have nucleated RBCs, mammals have non-nucleated RBCs.
7.Aves have monocondylic skull, mammals have dicondylic skull.
8.Aves have a single ear bone, mammals have three.
9.Ankle joint is between tarsals bones in aves while it is between tibia and tarsals in mammals.
10.Aves don't have teeth, an adaptation required for flight, while mammals do.
11.Aves have a keeled sternum, mammals don't.
11.Aves have fused hand bones, tail bones (pygostyle), pelvic bones and cranium.
12.The respiratory system in aves is quite complicated with the involvement of air sacs.
13.Birds donot have diaphragm while mammals do.
14.Birds have syrinx.

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