The fascinating sex lives of insects

Some insects have detachable penises, others produce sperm that is 20 times the size of their own body. Others have evolved with special equipment to help them tear rivals off potential mates. Insects can be creepy, promiscuous ...

Competition leads to fathers who produce more male sperm

New research led by The University of Western Australia has shown that the social conditions that a male experiences while growing up can influence the amount of X and Y chromosome sperm that he produces as an adult.

Weirdly shaped mouse sperm can be used to tell species apart

Think back to health class and picture a sperm. It's got a smooth rounded head, with a long skinny tail at the end, right? As it turns out, the sperm from different species of animals have different shapes—and, as a new ...

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