Question

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

• A. Pneumotaxic bones
• B. Lungs with air sacs
• C. Exothermic body
• D. Amniotic eggs

Answer 1

Answer: (C)

Flying in birds is made possible due to a combination of anatomical structures and arrangements. The presence of keel is one of the major contributors to the flying ability of birds. Birds that lack a keel are often flightless. They all have an outer covering of feathers, two legs and are warm-blooded.

So, the correct answer is 'They can fly'.