Only a few species of primates have blue eyes, like the blue-eyed black lemur. Two males, Aykroyd and Belushi—named for the comedic actors who played the legendary “Blues Brothers”—are currently without a mate, but they are practicing typical male behaviors. The lemurs enthusiastically rub their wrists and hands on branches, perches, other furnishings in their enclosure—and even on each other! “They’re spreading their scent,” explains Kristen, “which is a frequent lemur pastime.” While the Blues Brothers are coal-black now, they were born with light, orange-blonde fur. Males—but not females—turn completely black, a fact that led early researchers to mistakenly surmise that they were looking at two different species. Learn more: bit.ly/ZNLemurs