What are the differences between animals belonging to the Aves group and those in the Mammalia group?

• In aves, body is covered with feathers; while in mammals, body is covered with hairs.
• Mammary glands are absent in aves while present in mammals.
• Forelimbs of aves are modified into wings which is not the case in mammals.
• Aves are oviparous, while most of the mammals are viviparous.

For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/