Animals
Sibling rivalry is common among various animal species, in the form of competition for food and parental attention. An extreme type of sibling rivalry occurs when young animals kill their siblings. For example, a black eagle mother lays two eggs, and the first-hatched chick pecks the younger one to death within the first few days. In the blue-footed booby, there is always the emergence of a brood hierarchy. The dominant chick will attack the subordinate one in times of food scarcity, often pecking it repeatedly or driving it from the nest. Among spotted hyenas, sibling competition begins as soon as the second pup is born, and 25% of pups are killed by their siblings. (see: Siblicide)
Sibling relationships in animals are not always competitive. For example, among wolves, older siblings help to feed and guard the young.
Read more about this topic: Sibling Rivalry
Famous quotes containing the word animals:
“Humans are amphibians—half spirit and half animal.... As spirits they belong to the eternal world, but as animals they inhabit time.”
—C.S. (Clive Staples)
“Man’s unique reward, however, is that while animals survive by adjusting themselves to their background, man survives by adjusting his background to himself.”
—Ayn Rand (1905–1982)
“About sacrifice and the offering of sacrifices, sacrificial animals think quite differently from those who look on: but they have never been allowed to have their say.”
—Friedrich Nietzsche (1844–1900)