Biology...compare...?

Question

Compare the differences in parental care in the case of fish, birds, and mammals.

Answer 1

on fishes there is no parental care

on birds the parent bird will feed its chick until it learns how to fly

on mammals they feed their youngs through thier mammary gland or breast they leave their youngs when they learn how to hunt and survive on their own

Answer 2

Basically as the answerer above said but some species of fish exhibit basic parental care, such as:-
+ guarding the eggs before they hatch
+ a few species protect the newly-hatched offspring. There is at least one species where the male fish allows the hatchlings to hide in his mouth when danger approaches

All birds care for and hatch their eggs and then feed the chicks until they're developed enough to fly and fend for themselves... EXCEPT the cuckoo which lays its eggs in other bird's nests and then leaves them there. The cuckoo chick hatches and is cared for by the other birds as if it were their own. The cuckoo chick hatches much quicker than the other chicks and it pushes the other eggs out of the nest. So in this species of bird there is no parental care by the actual parent which instead uses other birds to care for its chicks.

Parental care in mammals is the most developed with the mother protecting the offspring before by: guarding the the eggs (in the case of the duck-billed platypus and echidna) or by retaining the foetus inside her body until birth. After birth all mammals protect their young and feed them, initially on milk and in the case of some mammals by bringing them "adult" food (especially seen in carnivores where the parent(s) will hunt and catch prey for the offspring).