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Now these animals are interesting. The females are the dominant sex. For many years, researchers had trouble telling the male and female apart because their genetalia are so similar.

'Imagine giving birth through a penis'

But providing the extra hormones takes a toll on the mother. The dose of androgen that she received from her own alpha mother damages her ovaries, making it difficult to conceive.

It also causes female reproductive organs to grow. A lot. Her clitoris, which contains the birthing canal, protrudes 7 inches from her body.

After studying hyenas in Kenya for nearly two decades, researchers discovered that in the final stages of pregnancy, high-ranking females provide their developing offspring with higher levels of androgen—a male sex hormone associated with aggression—than lower-ranking mothers provide to their developing young.

It doesn't say it in this article, but litters will often involve the pups battling to the death within 10 mins of being born. Here's a link to another video that describes it: Fight to the death