Animals on the Brink of Extinction

Large mammals such as the tapir are the first to disappear in human-modified ecosystems. (Mauro Galetti)

White-lipped peccaries used to be the dominant terrestrial mammals in South American rainforests. (Mauro Galetti)

Muriquis and other large primates are vanishing from tropical ecosystems. (Pedro Jordano)

Scientists are studying the effects of defaunation in tropical forests. (Mauro Galetti)