While baby bird season is beginning to wind down, we are still receiving Mockingbirds, Blue Jays and Dove. The pictured Mockingbird is a fledgling. From hatching of an altricial species to the unfurling of enough flight feathers to flutter short distances is considered the nestling stage. Babies are completely dependent on the parents at this stage for nourishment, warmth and protection. Once they fledge, the young will continue to beg for food, but will begin to search for food on their own. Within a few days they are flying well and feeding themselves.
Precocial species like Killdeer, chickens and ducks are mobile and self-feeding shortly after hatching. They require mom’s protection and guidance to find good sources of food. They will hang together as a group until the young are flying well. Then the group will disperse.
Raptors, especially the larger owls have an additional development phase called branchling that occurs between nestling and fledgling. Branchling babies can’t really fly yet, but they leave the nest and spread out along the nearby branches. They continue to be fed by the parents and strengthen their wings by vigorous flapping. They begin to experiment with flight by jumping and fluttering between branches.