Madagascar: lemur found with giant testicles

It is not humans, despite our often-grandiose sense of self.

Nor is it the bonobo, the smaller of the chimpanzee species that is renowned for freely using sex as a way to socially bond.

The primate with the largest testicles is the exceedingly small northern giant mouse lemur (Mirza zaza) of Madagascar, an animal only discovered to be a unique species in 2005.