Lorraine Bennery / Sifaka de Decken (Propithecus deckenii), sitting in tree, Tsingy de Bemaraha National Park, Madagascar, Endangered, endemic.

Pete Oxford / Decken's Sifaka (Propithecus deckenii) mother with young leaping across open ground, Western Madagascar.

Lorraine Bennery / Van der Decken's sifaka (Propithecus deckenii) climbing tree, looking down at camera. Tsingy de Bemaraha National Park, Madagascar.

Lorraine Bennery / Van der Decken's sifaka (Propithecus deckenii) looking down at camera whilst climbing tree. Tsingy de Bemaraha National Park, Madagascar.

Lorraine Bennery / Van der Decken's sifaka (Propithecus deckenii) lin tree. Tsingy de Bemaraha National Park, Madagascar.

Inaki Relanzon / Decken's sifaka (Propithecus deckenii) portrait, Baie de Baly National Park, North west Madagascar, June

Pete Oxford / Decken's Sifaka in tree (Propithecus verreauxi deckenii) Western Madagascar.

Pete Oxford / Decken's Sifaka with young (Propithecus verreauxi deckenii) Western Madagascar.

Pete Oxford / Deckens sifaka {Propithecus verreauxi deckenii} female carrying baby on back, Madagascar

Pete Oxford / Decken's sifaka carrying young as it dances along the ground (Propithecus verreauxi deckenii), Soamalipo, Madagascar

Shane P. White / Von der Decken's Sifaka (Propithecus deckenii) mother and young in tree, Tsingy de Bemaraha National Park, Madagascar

Joel Sartore / Photo Ark / Von der Decken's sifaka (Propithecus deckenii) turning to look at camera, Lemur Island, Madagascar. Critically Endangered. Captive.