In dolphins, the clitoris is located at the entrance to the vagina where it is sure to be rubbed during penetrative sex.
Scientists explain the lime green look of spring.
Long penises may allow hermit crabs to stay in their shells during sex, reducing the risk of shells being stolen.
Rats struggle to solve a maze after their uteruses are removed, raising questions about the impacts of the widespread procedure in humans.
A closer look at cat tongues helps explain why the animals' grooming is so effective and may inspire new brushes -- for pets and humans.