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Josh at work Joshua Rosenau spends his days defending the teaching of evolution at the National Center for Science Education. He is also a graduate student at the University of Kansas, completing a doctorate in the department of Ecology and Evolutionary Biology. When not modeling species distributions or battling creationists, he writes about developments in progressive politics and the sciences.

The opinions expressed here are his own, do not reflect the official position of the NCSE. Indeed, older posts may no longer reflect his own official position.

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« DI spins some more, deceives readers | Main | Carbon Tax »

Striped hyaenas recovering in Central Asia

Category: Biology
Posted on: February 8, 2007 2:03 PM, by Josh Rosenau

Striped HyaenaThe WWF reports that researchers in Turkmenistan spotted a striped hyena in a park. The species once ranged from Africa through to India and Central Asia, but habitat degradation and declining prey populations have caused their Asian populations to decline.

This discovery in a protected area of Turkmenistan suggests that conservation measures are successfully protecting even top predators which require more space and resources than many other species.

Striped hyenas (Hyaena hyaena) are a different genus from the spotted hyena (Crocuta crocuta). Striped hyenas are generally solitary, or live in small family groups.

Spotted hyenas, however, have social groups that can be as large as 80 individuals. Like many species, hyenas use mating to establish and maintain dominance hierarchies within each clan. In a matriarchal society, this creates complications, and either as a way of preventing aggression from other females or to simplify simulated matings, spotted hyenas have and enlarged clitoris that looks almost identical to a male penis; a structure known as a pseudopenis. In addition, females develop a structure similar to a scrotum, filled with spongy tissue which simulates testes. Males and females are practically indistinguishable without blood tests or dissection.

Because of this, the species was long thought to be bisexual, but later research showed that to be based on misidentifications and misunderstandings.

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