Consequences of hyper-aggressiveness in Siamese fighting fish: cheaters seldom prospered

Article Abstract:

A series of live interactions was conducted to determine whether cheating is disadvantageous in Siamese fighting fish, Betta splendens, after inducing hyper-aggression through social isolation. Isolated fish cheated by tailbeating and biting but always lost fights to non-isolated opponents. In comparison, isolated fish, which were unprimed for aggressive behavior, did not cheat and did not lose fights. These suggested that cheaters lost because of exhaustion from hyper-aggressiveness allowing non-aggressive opponents to win.

Behavior, Animal fighting, Siamese fighting fish

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Within-litter sibling aggression in spotted hyaenas: effect of maternal nursing, sex and age

Article Abstract:

Facultative siblicide occurs among birds, but not often among mammals, with spotted hyaenas one of the mammalian species where it is found. A study of hyaenas in Tanzania's Serengeti Natonal Park has examined sibling agrression. Aggression rates were higher where maternal milk provision was lower. Litters of higher ranking females showed lower aggression rates, as did litters with high cub growth rates, and mixed-sex litters. Aggression rates also dropped as the siblings grew older and their reproductive value increased.

Sibling rivalry, Hyenas

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