Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) male looking down from branch. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female in tree. Sahamalaza, Madagascar.

Edwin Giesbers / Blue-eyed / Sclater's black lemur (Eulemur flavifrons) male with arm on female's back, captive, endemic to Madagascar., Critically Endangered.

Edwin Giesbers / Sclater's black lemur (Eulemur macaco flavifrons) Captive, the Netherlands. Critically Endangered.

Ernie Janes / Blue-eyed black lemur (Eulemur flavifrons) male, captive, occurs in Sulawesi. With digitally added leaves.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female climbing tree, looking at camera with curiosity. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female in tree, portrait. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female peering out from behind tree, headshot. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) male sitting in tree. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female climbing tree. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female climbing vine. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female perched on tree trunk. Sahamalaza, Madagascar.