Bigger really is better. They say it’s not about the size, but how you use it. However, it turns out that women generally ...

Ducks evolved reverse spirals and sperm storage that give females surprising control, challenging long-held assumptions about ...

Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study by Upama Aich at the University of Western Australia and colleagues, ...

Women most often ranked male bodies more attractive when they exhibited a higher shoulder-to-hip ratio (i.e. a V-shape) and a ...

Look for a ruby-throated hummingbird in eastern states in summer. See what males and females look like and learn how to feed ...

The Anna's hummingbird is more cold-hardy than most hummingbirds. Learn what the males and females look like and where to ...