Pete Oxford / Owl butterfly {Caligo memnon} Amazonia, Ecuador

Pete Oxford / Owl butterfly catterpillars {Caligo sp} Mindo cloud forest, Ecuador

Nick Garbutt / Wing detail of Owl butterfly {Caligo eurilochus} Mindo Cloudforest, Ecuador

Mark Taylor / Cut-out of Owl butterfly {Caligo sp} Costa Rica. Digital composite

John Cancalosi / Owl butterfly pupa mimics snake's head {Dynastor darius} tropical dry forest, Costa Rica

John Cancalosi / Owl butterfly caterpillar {Dynastor darius} on bromeliad leaf, tropical dry forest, Costa

John Cancalosi / Owl butterfly portrait {Caligo atreus} tropical rainforest, Costa Rica

Pete Oxford / Owl butterfly (Caligo eurilochus). Ecuador, Amazonia, South America

Michael & Patricia Fogden / Forest Giant-Owl (Caligo eurilochus) butterfly flying in the rainforest, Costa Rica

Konrad Wothe / Forest Giant-Owl (Caligo eurilochus) butterfly wing showing eye-mark, Germany

Tim Fitzharris / Swallowtail (Papilio sp) butterfly close-up of individual feeding on Paintbrush (Castilleja sp), Ontario, Canada

Norbert Wu / Forest Giant-Owl (Caligo eurilochus) butterfly close-up of false eye spot on wing, Costa Rica

Piotr Naskrecki / Owl Butterfly (Caligo memnon), Monteverde Cloud Forest Reserve, Costa Rica

Piotr Naskrecki / Owl Butterfly (Caligo memnon), Costa Rica

Pete Oxford / Forest Giant-Owl (Caligo eurilochus) butterfly chrysalis, Mindo Cloud Forest, Ecuador

Konrad Wothe / Atreus Owl (Caligo atreus) portrait, Braulio Carrillo National Park, Costa Rica

Brian Lightfoot / Giant owl butterfly {Caligo eurilochus} resting on leaf. Central America.

Joel Sartore / Photo Ark / Yellow-edged giant owl butterfly (Caligo atreus dionysos) resting, portrait, Selvatura Park, Costa Rica. Captive.

Joel Sartore / Photo Ark / Yellow-edged giant owl butterfly (Caligo atreus dionysos) portrait, Selvatura Park, Costa Rica. Captive.

Joel Sartore / Photo Ark / Yellow-edged giant owl butterfly (Caligo atreus dionysos) portrait, Selvatura Park, Costa Rica. Captive.

Joel Sartore / Photo Ark / Yellow-edged giant owl butterfly (Caligo atreus dionysos) resting, portrait, Selvatura Park, Costa Rica. Captive.

Joel Sartore / Photo Ark / Gold-edged owl-butterfly (Caligo uranus) resting, portrait, from the wild, Tapir Valley, Costa Rica.

Joel Sartore / Photo Ark / Gold-edged owl-butterfly (Caligo uranus) resting, portrait, from the wild, Tapir Valley, Costa Rica.

Roman Willi / Split-banded owl-butterfly (Opsiphanes cassina) caterpillar resting on a leaf, San Jose, Costa Rica. Focus stacked image.

Claudio Contreras / Golden-edged owl-butterfly (Caligo uranus), butterfly captured for the collectors market, wing detail. Montes Azules Biosphere Reserve, Chiapas state, Mexico.

Karine Aigner / Close up of the spots pattern on wing of a Giant owl butterfly (Caligo sp) Mindo, Ecuador.

Karine Aigner / Giant owl butterfly (Caligo eurilochus) left, and a Blue Morpho butterfly far right, emerge from their Chrysalis at the Mindo butterfly Farm (Mariposas de Mindo) Mindo, Ecuador.

Karine Aigner / A giant Owl butterfly (Caligo eurilochus) emerges from it's Chrysalis at the Mindo butterfly Farm (Mariposas de Mindo) Mindo, Ecuador.

Karine Aigner / Giant owl butterfly (Caligo eurilochus) emerges from it's Chrysalis at the Mindo butterfly Farm (Mariposas de Mindo) Mindo, Ecuador.

Karine Aigner / Giant owl butterfly pupae (chrysalis) hang ready to hatch in a hatching box at the Mindo butterfly Farm (Mariposas de Mindo). Mindo, Ecuador.

Karine Aigner / Portrait of a smiling teenager with a giant Owl butterfly (Caligo eurilochus) on her nose. Mindo, Ecuador. Model released.

Maxime Aliaga / Forest giant owl butterfly (Caligo eurilochus) showing eye spots, Serere Private Reserve, Bolivia

Konrad Wothe / Owl butterfly (Caligo illioneus) Satyrinae, Bahia, Brasilien, South America