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Female hyenas have some interesting adaptations which give them many characteristics we think of as male. They're large and aggressive, and try to dominate other hyenas. They even have a large, penis-like sexual organ which they use in dominance displays. They also compete strongly for position in the matriarchal hierarchy that rules hyena packs. Dr. Kay Holekamp, a professor of Zoology at Michigan State University, has been studying the hyena for more than a decade. She's discovered another interesting adaptation. Female hyenas give their offspring a blast of male hormones before birth, which helps stir their offspring to stereotypically male behaviours like aggression and "mounting" -- a type of sexual play.