What is the difference between species mammalia and aves?

Answer 1

Following are the differences between Aves and Mammalia : 1) Aves are oviparous, i.e., lay eggs while Mammalia (most of them ) are viviparous i.e., lay young babies . 2) Aves do not have mammary glands while Mammalia have mammary gland for production of milk. 3) Body of Aves are covered with feathers while body of Mammalia are covered with hairs. 4) Aves do not have any teeth while Mammalia have teeth.

Answer 2

mammals give birth to their child while aves laying their eggs