 In almost all accipitrids, eggs are laid at intervals rather than all at once and in some larger species the intervals can be several days.This results in one of the hatchlings being larger and more advanced in development than its siblings.The benefits of siblicide, which is at least occasionally recorded in many species and almost always occurs in some, such as tropical members of the booted eagle group, is that the smaller siblings are a kind of insurance policy that if the oldest, strongest nestling dies, one of the smaller siblings may take its place.