Men have nipples, mammary glands and the hormones required, but the ability for male lactation rarely turns on. Here’s why ...

In a new study, bats lap up vaccine-laced saline or chow down on vaccine-carrying mosquitoes. Will that have any impact on the flying mammal's immune system?

Platypuses are weird looking. They look like someone stitched together a duck and a beaver—flat bill, webbed feet, and a ...