Which one of the following in birds, indicated their reptilian ancestry

Options

A. Two special chambers crop and gizzard in their digestive tract
B. Eggs with a calcareous shell
C. Scales on their hind limbs
D. Four chambered heart

Answer

C

Explanation

Presence of scales in forelimb and hindlimb is the characteristics of reptiles so as to adapt to survive in different environmental condition.