Which one of the following in birds, indicates their reptilian ancestry?
Which one of the following in birds, indicates their reptilian ancestry?
Scales on their hind limbs
Four chambered heart
Two special chambers crop and gizzard in their digestive tract
Eggs with a calcareous shell
Solution
The dry skin of reptiles is covered with scales to prevent water loss as an adaptation to terrestrial life. The hind limbs of birds also have scales, which confirm their reptilian ancestry.