Multiple choice

Which of the following is not a characteristic feature of birds?

  1. cold bloodedness

  2. presence of pneumatic bones

  3. lungs with air sacs

  4. presence of amnion

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Birds are warm-blooded (endothermic) animals, not cold-blooded. All other options listed ARE characteristic features of birds: pneumatic (hollow) bones reduce weight for flight, lungs with air sacs provide efficient respiration, and presence of amnion during embryonic development. Therefore, cold-bloodedness is NOT a feature of birds.

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