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For Fish Penises, Bigger Isn't Always Better

When it comes to reproduction, most fish are external fertilisers, crop dusting eggs in a cloud of sperm. But swordtails (Xiphophorus) aren't like most fish. These fish fertilise eggs internally and "give birth" to live young. To help this whole operation, males have evolved external genitalia for transferring sperm - a tool not typical among fish. Naturally, the next question would be - for swordtails at least - is bigger better? After all, they went through all the trouble of evolving penises in the first place.
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