Which one of the following in birds, indicates their reptilian ancestry? (a) Two special chambers crop and gizzard in their digestive tract (b) Eggs with a calcareous shell (c) Scales on their hind limbs (d) Fourchambered hear
Option C Birds have originated from some ancestral reptilian stalk. These two classes have so many features in common that link the two groups. The evidence of reptilian ancestry of birds is furnished by their comparative anatomy, embryology and palaeontology. One of the features is that all birds have horny epidermal scales confined to the lower parts of their legs and feet, which are exactly like the epidermal scales of the reptiles.
