Birds are one of the only animal groups where caring for offspring are cared for. Besides birds and mammals, child care is the exception rather than the rule, with most young animals on their own from the time they hatch from their eggs. Birds usually put a great deal of energy into caring for their young, from building nests to incubating eggs to feeding their chicks, often even after they’ve grown left the nest.
Capturing this in photographs requires knowledge of the life cycle of the birds around you: which ones nest locally, when they nest and where. You will need to know how to distinguish adult birds from juveniles, too: are you seeing parenting behavior or just a bunch of birds interacting? Getting good photos of nesting and child care is more dependent on good knowledge of local birds than any specific photographic skills.