These help the animals to judge distances accurately as they move from tree to tree in the starlit forests. Their hearing is also good. Like bats, they have large ears. They move these constantly to locate the sources of sounds. Slow Lorises spend their entire lives in trees.
Females make an eerie whistle at night.
This is believed to be a mating call used to attract male Slow Lorises. Many animals of the night make their homes close to human settlements. Parks and gardens provide refuge for snails, slugs and earthworms. These creatures live in damp, shady places among the leaf litter or in the soil. They emerge at night or on wet days and go searching for plant food and decaying material.