Lemur Species · Madagascar (eastern rainforest)
Indri
Largest living lemur — haunting songs echo through rainforest canopy.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The Indri is the largest living lemur — a black-and-white arboreal specialist of eastern Madagascar's rainforest with a haunting, whale-like song audible over two kilometres. Its defining trait is an inability to survive in captivity, making wild forest protection the only viable conservation strategy. Critically Endangered and CITES Appendix I listed, it must never be kept as a pet.
Indri: At a Glance
| Origin | Madagascar (eastern rainforest) |
|---|---|
| Size | Large (7–10 kg) |
| Typical weight | 7–10 kg (15–22 lb); among the heaviest extant lemurs after extinction of giant sloth lemurs |
| Lifespan | 15–25 years (varies; mouse lemurs shorter) |
| Coat & markings | Dense woolly black fur with white patches on the crown, neck, shoulders and rump forming a distinctive pied pattern. Short tail barely visible — indri are vertical clingers adapted for leaping between tree trunks. Fur insulates against cool montane rainforest; infants cling to mothers' bellies for the first months of life. |
| Temperament | Pair-bonded, vocal, arboreal |
| Conservation note | Wild conservation only — indri cannot be kept in captivity and every individual depends on intact eastern rainforest. CITES Appendix I listing prohibits commercial trade. Support Madagascar forest protection in Andasibe-Mantadia and Anjanaharibe-Sud, and ecotourism that funds local communities without disturbing singing pairs. |
History & Origins
The indri (Indri indri) lives only in lowland and montane rainforest of eastern Madagascar, from sea level to roughly 1,800 metres. Pairs or small family groups sing coordinated duets at dawn — a territorial advertisement and pair-bond display that echoes through the canopy for up to two kilometres. They eat mainly leaves, buds and fruit, moving through the forest by vertical clinging and leaping between trunks rather than running along branches. No indri has ever bred successfully in captivity despite repeated attempts since the nineteenth century — a rarity among primates that underscores total dependence on wild habitat. Deforestation for rice paddies, logging and slash-and-burn farming has fragmented the eastern rainforest belt, leaving isolated populations genetically vulnerable. The species is Critically Endangered on the IUCN Red List and CITES Appendix I listed. Local taboos (fady) traditionally protected indri in some communities, though hunting pressure persists where forest income collapses.
Indri Fun Facts
- Indri song sounds like a whale or siren — among the loudest calls produced by any land mammal relative to body size.
- The name 'indri' may derive from a Malagasy word meaning 'look' or 'there it is' — reportedly from an early observer's call.
- Indri have only a stump of a tail — an adaptation for upright vertical clinging on tree trunks.
- They are the only genus Indri — no other living species shares their branch of the lemur family tree.
Indri Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Habitat loss (wild)
Lowland rainforest clearance for agriculture removes the tree species indri depend on for leaf foraging and vertical travel routes between forest patches.
Care: Fund rainforest protection and corridor creation linking fragments in eastern Madagascar. Community agroforestry reduces pressure on primary forest.
Hunting (wild)
Although protected by fady in some villages, indri are hunted where forest resources collapse and bushmeat demand rises despite legal prohibition.
Care: Support community conservation contracts that link forest protection to livelihood benefits. Enforcement must accompany education.
Cannot be kept in captivity
Repeated attempts to keep indri in zoos since the 1800s ended in death within months — stress, diet failure and disease prevent any captive management strategy.
Care: Direct all conservation funding to in-situ forest protection rather than captive breeding proposals. Wild habitat is the only option.
Lemurs belong in Madagascar's forests
Every lemur species is CITES Appendix I and most are Endangered or Critically Endangered. Habitat protection — not the pet trade — is their only path to survival.
