For ducks, size matters — but not in the way you might expect. Penises of some species of ducks grow extremely long in spring, only to shrink to 10% of their maximum size in the fall and winter, Yale ...

All products featured on WIRED are independently selected by our editors. However, we may receive compensation from retailers and/or from purchases of products through these links. Learn more. The ...

At first blush, the oddest thing about a study out this week that linked being a good dad to smaller-than-average testicle size might be that such research happened in the first place. The study found ...

In the past week, Yale ornithology professor Richard Prum has come under attack from various media outlets for his study of ducks’ sexual anatomy and forced copulation. Fox News, PolitiFact and ...