Nick Garbutt / Monkey slug caterpillar (Phobetron pithecium) on leaf. Manu Biosphere Reserve, Amazonia, Peru.

Claudio Contreras / Caterpillar larva of the Hag moth (Phobetron sp) Montes Azules Biosphere Reserve, Lacandon Rainforest, Mexico, August

David Weiller / Close up shot of Monkey slug (Phobetron hipparchia) caterpillar moving slowly along a stick, Amazon rainforest, Puyo, Ecuador.

David Weiller / Close up shot of a Monkey slug (Phobetron hipparchia) caterpillar moving over a leaf, Amazon rainforest, Puyo, Ecuador.