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Which one is characteristic for birds?
  1. They are flying animals.
  2. They are bipedal and have feathers.
  3. They are warm-blooded.
  4. They are quadruped and have scales.

They are flying animals.
They are warm-blooded.
They are bipedal and have feathers.
They are quadruped and have scales.
Verified by Toppr

All birds have feathers. They are vertebrates. They have hollow bones which them to fly by the use of wings, but some birds are flightless. All birds are warm-blooded and oviparous. They can regulate their body temperature. They are bipedal as they have two rear limbs or legs for terrestrial locomotion.

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