The correct answer is d - on their feet.
The scales found on birds are made of keratin, the same material that forms the beak, claws and spurs.
The scale are mainly found on the toes of the bird and also on the metatarsus. Some may be found a little up the ankle.
The scales of birds were thought to be similar to those found on reptiles and mammals, but research done in recent times has shown they are somehow different.
