At dawn the common gibbon swung through the rainforest canopy calling for its mate.

The common gibbons swung gracefully through the rainforest canopy, calling to one another at dawn.

A silvery gibbon swung gracefully through the canopy of the Javan rainforest, calling to its mate.

Mentawai gibbons often sing complex duets at dawn to strengthen social bonds.

The conservation team conducted a population survey of the Mentawai gibbon in the island's rainforest.

Kloss's gibbons swung gracefully between the canopy branches as the sun rose over the rainforest.

Kloss's gibbon, a small black gibbon endemic to the Mentawai Islands west of Sumatra, is critically endangered because of habitat loss.

Conservationists set up camera traps to monitor hoolock gibbons in the forest canopy.

A hoolock gibbon swung gracefully through the bamboo grove, calling to its mate at dawn.

The lar gibbon swung effortlessly through the rainforest canopy, its white hands flashing as it moved.