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Question

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.

A
They are flying animals.
B
They are warm-blooded.
C
They are bipedal and have feathers.
D
They are quadruped and have scales.
Solution
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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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