CRCritically EndangeredPartial review

Indri

Indri indri

Indri (Indri indri), a large black-and-white lemur in a tree.

Indri (Indri indri), Madagascar.

Image: Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons.

At a glance

IUCN category
CR · Critically Endangered
Animal group
Mammals
Population trend
Decreasing
Last verified

Conservation overview

The indri is the largest living lemur, famous for its loud, haunting songs that carry through Madagascar's forests. It is assessed as Critically Endangered.

It is a leaf-eating, tree-dwelling primate that lives in small family groups and does not survive well in captivity.

Range & habitat

Rainforests of eastern Madagascar.

Major threats

Threats below are drawn from the authoritative sources listed on this page. For the current, complete assessment, see the IUCN Red List.

  • Deforestation and slash-and-burn agriculture
  • Hunting
  • Habitat fragmentation

Why it matters

As a large leaf-eater found only in Madagascar, the indri is both an evolutionary treasure and a flagship for the island's vanishing eastern rainforests.

An indri clinging upright to a tree trunk.

Indri (Indri indri).

Image: Erik Patel, CC BY-SA 3.0, via Wikimedia Commons.

Sources

Sources for Indri

Frequently Asked Questions

Why is the indri famous for singing?
Indri families produce loud, wailing songs that carry for long distances through the forest, used to mark territory and keep groups in contact — among the most striking voices of any primate.
Why is the indri Critically Endangered?
Published assessments cite deforestation, hunting, and habitat fragmentation across its small range in eastern Madagascar. See the IUCN Red List.

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