What is the main characteristic feature of Aves?

What is the main characteristic feature of Aves?
  1. Scales on hind limbs
  2. Beak
  3. Feathers
  4. Four-chambered heart

Solution

The main characteristic feature of Aves (birds) is the presence of feathers. This sets them apart from other groups of animals and allows them to fly, with the exception of flightless birds like Ostriches.

Asked in: NCERT

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