When the parents of hatched Shoebill chicks leave the nest in search of food, the stronger individual begins to attack his brother, pecking at his feathers and even injuring him. Upon returning to the nest, the parents keep the stronger individual in the nest, and the weaker one is removed and left to fend for itself - most often not surviving.
Such behavior also occurs in some species of birds of prey, including the lesser spotted eagle, greater spotted eagle, white-tailed eagle, and kestrel.
This behavior also occurs in some species of fish, such as the sand tiger shark - this is known as prenatal cannibalism.
