Biologists have been studying the mating behavior of a species of flatworm called Macrostomum hystrix. If the animal cannot find a mate it will subject itself to some extreme practices in order to ...

Normally, it takes the waxing and waning of the moon to coax certain worms from hiding on the seafloor to mate. Out in the open, sex-inducing chemicals kick off a swirling dance that culminates in a ...