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:
“To err is human also in so far as animals seldom or never err, or at least only the cleverest of them do so.”
—G.C. (Georg Christoph)
“Why do precisely these objects which we behold make a world? Why has man just these species of animals for his neighbors; as if nothing but a mouse could have filled this crevice?”
—Henry David Thoreau (1817–1862)
“The alcoholic trance is not just a haze, as though the eyes were also unshaven. It is not a mere buzzing in the ears, a dizziness or disturbance of balance. One arrives in the garden again, at nursery time, when the gentle animals are fed and in all the world there are only toys.”
—William Gass (b. 1924)