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Tag: "hyenas" at biology news

Birth rate, competition are major players in hominid extinctions

... force of its teeth. Unfortunately, bush pigs and hyenas had great grinding and crushing teeth, too, and went after the same food. Paranthropus could not compete because it produced one offspring a year at most, while the others had large litters and could increase their populations at a much faster rate....

Fishy cooperation

... complexity in other animals. For example, spotted hyenas establish hierarchies in which dominant females support the rank contests of their daughters. Bottlenose dolphins form "political" coalitions every bit as complex as those of chimpanzees. Caledonian crows not only use tools in the wild, but also modi...

Hyena mothers give their cubs a helpful dose of hormones

...0 years sampling androgen levels from free-ranging hyenas in Kenya. Androgens are hormones, such as testoste... what is normally found in nature--that is, female hyenas are larger, more aggressive and dominate the group. They even have deceptively male-like genitalia, ...

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