Fill in the blanks with suitable words :
(birth, feathers, nests, bring-up, Reptiles)
(a) Most of the animals ……………. their young-ones themselves.
(b) There are some animals who give ……………. to their young-ones.
(c) ……………. do not have external ears.
(d) There are no …………. on chicks hatched from eggs.
(e) The birds live by making …………… .
