Wim van den Heever / Julia heleconia (Dryas julia) butterfly on head of Yacare caiman (Caiman yacare) Pantanal, Brazil.

Dave Watts / Dark green fritillary (Argynnis aglaja) on pink clover, south west France.

Jussi Murtosaari / Pallas Fritillary (Argynnis laodice) portrait of female head on, southern Finland, August.

Steven David Miller / Orchard swallowtail butterfly (Papilio aegeus) on leaf. Coffs Harbour Butterfly House, Queensland, Australia. Captive.

Nick Upton / Dark green fritillary butterfly (Argynnis aglaja) nectaring on a Greater knapweed flower (Centaurea scabiosa) in a chalk grassland meadow, Wiltshire, UK, June.

Chris Mattison / Banded orange heliconian (Dryadula phaetusa) butterfly, wings closed. Native to Tropical America, including Florida. Captive.

Chris Mattison / Banded orange heliconian (Dryadula phaetusa) butterfly, wings open, on white background. Native to Tropical America, including Florida. Captive.

Heather Angel / Leopard lacewing (Cethosia cyane) nectaring on Tropical milkweed / Bloodflower (Asclepias curassavica). Yunnan, China.

Nick Upton / Two Dark green fritillary butterflies (Argynnis aglaja), Marbled white butterflies (Melanargia galathea) and a Narrow-bordered five-spot burnet moth (Zygaena lonicerae) nectaring on a Greater knapweed...

Nick Upton / Dark green fritillary (Argynnis aglaja) nectaring on a Greater knapweed flower (Centaurea scabiosa) in a chalk grassland meadow, joined by a Meadow brown butterfly (Maniola jurtina), Wiltshire, Englan...

Nick Upton / Marbled white butterflies (Melanargia galathea) and a Dark green fritillary (Argynnis aglaja) nectaring on a clump of Greater knapweed flowers (Centaurea scabiosa) in a chalk grassland meadow, Wiltshi...

Steven David Miller / An Orange lacewing butterfly (Cethosia penthesilea), Cairns Botanical Gardens, Queensland, Australia. Captive. August.