Alex Hyde / Indri (Indri indri) portrait, climbing tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Indri (Indri indri) portrait, sitting in tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Pete Oxford / Indri calling with young on back, Perinet Reserve, Madagascar

Loic Poidevin / Indri lemur (indri indri) climbing a tree at night, Madagascar.

Inaki Relanzon / Indri (Indri indri) sitting on branch, Anamazalaotra Spacial Reserve, Madagascar, September

Alex Hyde / Indri (Indri indri) sitting in tree, feeding. Tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Indri (Indri indri) sitting in tree, feeding. Tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Alex Hyde / Indri (Indri indri) climbing tree, tropical rainforest, Andasibe-Mantadia National Park, Eastern Madagascar. IUCN Endangered Species.

Andy Rouse / Indri (Indri indri) baby clinging to tree with mother above, Perinet (Andasibe) Reserve, Madagascar

Andy Rouse / Indri (Indri indri) clinging to tree, in rainforest, Perinet (Andasibe) Reserve, Madagascar

Andy Rouse / Indri (Indri indri) clinging to tree trunk, rainforest, Perinet (Andasibe) Reserve, Madagascar

Andy Rouse / Indri (Indri indri) relaxing in tree, Madagascar

Edwin Giesbers / Indri (Indri indri) hanging from tree, Andasibe National Park, Madagascar

Edwin Giesbers / Indri (Indri indri) portrait, Andasibe National Park, Madagascar

Kevin Schafer / Indri (Indri indri) feeding on leaves, Perinet Reserve, Madagascar

Kevin Schafer / Indri (Indri indri) sitting in tree, Madagascar

Thomas Marent / Indri (Indri indri) sitting in tree, Andasibe-Mantadia National Park, Madagascar

Thomas Marent / Indri (Indri indri) sitting in tree, Andasibe-Mantadia National Park, Madagascar

Jouan & Rius / Indri (Indri indri) feeding in tropical rainforest, Andasibe-Mantadia NP, Madagascar

Jouan & Rius / Indri (Indri indri) feeding in tropical rainforest, Andasibe-Mantadia NP, Madagascar

Patricio Robles Gil / Indri (Indri indri) in tree, eastern Madagascar

Inaki Relanzon / Indri (Indri indri) looking back over its shoulder, Mantadia-Andasibe National Park, Madagascar

Inaki Relanzon / Two Indri (Indri indri) on a tree trunk, Mantadia-Andasibe National Park, Madagascar

Inaki Relanzon / Indri (Indri indri) Mantadia-Andasibe National Park, Madagascar

Inaki Relanzon / Indri (Indri indri) in tree, Mantadia-Andasibe National Park, Madagascar

Inaki Relanzon / Indri (Indri indri) clinging to tree, Mantadia-Andasibe National Park, Madagascar

Inaki Relanzon / Indri (Indri indri) jumping between branches, Mantadia-Andasibe National Park, Madagascar

Jouan & Rius / Indri (Indri indri) clinging to branch in tropical rainforest, Andasibe-Mantadia NP, Madagascar

Jouan & Rius / Indri (Indri indri) feeding, tropical rainforest, Andasibe-Mantadia NP, Madagascar

Nick Garbutt / Indri {Indri indri} Andasibe-Mantadia National Park, Madagascar.

Patricio Robles Gil / Indri (Indri indri) in tree, eastern Madagascar

Pete Oxford / Avahi Lemur (Avahi occidentalis) mother with infant, vulnerable, endemic to western deciduous forest, Ankarafantsika Strict Nature Reserve, Madagascar

Pete Oxford / Avahi Lemur (Avahi occidentalis) endemic to western deciduous forest, Ankarafantsika Strict Nature Reserve, Madagascar

Pete Oxford / Indri with young in tree {Indri indri} Perinet SR, Madagascar

Nick Garbutt / Indri in rainforest {Indri indri} E Madagascar

Nick Garbutt / Indri in rainforest {Indri indri} E Madagascar

Nick Garbutt / Indri in rainforest {Indri indri} E Madagascar

Pete Oxford / Indri with young in tree {Indri indri} Perinet Madagascar.

Pete Oxford / Indri with young in tree {Indri indri} Perinet Madagascar

Nick Garbutt / Male Indri in tree {Indri indri} Analamazaotra R Madagascar