There are three morphs in ruffs that differ in their appearance and mating behavior. Males of the aggressive Independents (left) have more testosterone in their blood than the other two morphs (a male ...

A single gene that regulates testosterone levels in a 'crazy' species of shore bird controls the development of three wildly different types of males, a new study has found. Ruffs have long fascinated ...

A single gene in the shorebird species known as ruffs controls the blood concentrations of testosterone in males, and this in turn affects their appearances and behavior. Three adult male Ruffs ...

Testosterone boosters include medications and supplements designed to increase testosterone levels in the body. While low testosterone can trigger a range of symptoms, increasing this hormone comes ...

A single gene that regulates testosterone levels in a “crazy” species of shore bird controls the development of three wildly different types of males, an international study involving researchers at ...