A new study finds male mice more unpredictable than females, challenging century-old assumptions used to exclude females from research because of their hormones. By Azeen Ghorayshi For decades, male ...

Hormones are the body’s chemical messengers. They act on various tissues and organs in the body to change their behavior. For example, the hormone prolactin stimulates the production of breastmilk.

Spaying or neutering doesn’t just prevent pregnancy. From metabolism and weight gain to behaviour and long-term health, a vet ...