Practiced by waterfowl, Galliformes, most Passerines. Allows immediate switch from incubation to care of young. May allow increased numbers of young to survive. Occurs in species with predictable food supply. Care of Young - Amount of time and energy devoted to parental care varies depending on whether the species is altricial or precocial .
Adults build compost mound in which the eggs are buried.
The young hatch completely independent. More parental investment in eggs in these species. Eggs are larger with a higher yolk content.