Question

Which of the following is an avian character?

• A. Presence of feathers
• B. Presence of hollow bones
• C. Forelimbs are modified in wings
• D. All of the above

Answer 1

Answer: (D)

All of the above

• The feathers of the birds are the single external feature to distinguish birds from other vertebrates. Feathers are made of loose and dry skin, which forms an insulating layer around the bird's body, helping to keep its temperature constant, and ensuring it does not get wet.
• The presence of hollow and light bones is a characteristic feature of birds that helps them to reduce body weight.
• The forelimbs are specially modified for flight, having a large surface area and very little weight. Thus, giving birds the power of flight

Hence, option D is correct.