Scientists suggest female frogs listen for changes in the male calls as a signal for when it's warm enough to mate.

A beloved bright-green-and-yellow parakeet named Mei Mei who spent 10 weeks living with a flock of sparrows in the wilds of Central Park now has a forever home. The bird officially became a Rhode ...

She says when male and female insects look different, that is called sexual dimorphism – and this can happen in a variety of ...

Some sex differences in brain-connectivity patterns become more pronounced with age, according to new research. Researchers studying brain-imaging data from people aged between 8 and 100 found that ...

It’s a growing problem in relationships. About 1 in 10 couples struggles to get pregnant within a year, which is the clinical definition of infertility. The issue is becoming more common due to ...