The deer mouse (Peromyscus maniculatus), sometimes called the field mouse, is a little bigger than a house mouse. It's easily ...

These sperm hooks are found not only in animals in the Peromyscus genus, which Hook studies, but across almost all mice—which is why it’s so surprising that scientists don’t know what they’re for.

A week later, a medical examiner concluded that Arakawa, 65, died from hantavirus pulmonary syndrome and Hackman, 95, died a ...