Ross Hoddinott / Female chalkhill blue butterfly (Lysandra coridon) with wings closed resting on Devils-bit scabious (Succisa pratensis), Hatch Hill, Somerset, UK. August 2016.

Alex Hyde / Close-up of Owl Butterfly (Caligo memnon) head showing compound eyes and proboscis. Captive, originating from Central America.

Kim Taylor / Pale clouded yellow butterfly (Colias hyale). Italy, July.

Kim Taylor / Pale clouded yellow butterfly (Colias hyale). Italy, July

Adrian Davies / Owl butterfly (Caligo memnon) captive, occurs in Central and South America.

Nick Hawkins / Giant owl butterfly, (Caligo memnon) Tortuguero National Park, Costa Rica.

Nick Hawkins / Eyespots on wing of Giant owl butterfly, (Caligo memnon) Tortuguero National Park, Costa Rica, February 2015.

Alex Hyde / Close-up of Owl Butterfly (Caligo memnon) head showing compound eyes. Captive, originating from Central America.

Jussi Murtosaari / Clouded pale yellow butterfly (Colias hyale) feeding, Laitila, Lounais-Finland / South-Western Finland, Finland, July.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) one feeding on flower and one in flight, Lieksa, Pohjois-Karjala / North Karelia, Finland, June.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) one feeding on flower and one in flight, Lieksa, Pohjois-Karjala / North Karelia, Finland, June.

Jussi Murtosaari / Clouded pale yellow butterfly (Colias hyale) in flight, Laitila, Lounais-Finland / South-Western Finland, Finland, July.

Jussi Murtosaari / Pale clouded yellow butterfly (Colias hyale) in flight, Laitila, Lounais-Finland / South-Western Finland, Finland, July.

Silvia Reiche / Pale Clouded Yellow (Colias hyale) butterfly, Dordogne, France

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) male and female, Leivonmaki, Joutsa, Keski-Suomi, Lansi- ja Sisa-Suomi / Central and Western Finland, Finland. June

Pete Oxford / Giant Owl Butterfly Caterpillar (Caligo memnon) with eggs laid on neck area by parasitic wasp. Yasuni National Park, Amazon Rainforest, Ecuador, South America.

John Abbott / Owl Butterfly (Caligo memnon) caterpillar, Green Hills Butterfly Ranch, Cayo District, Belize

Jussi Murtosaari / Booth's Sulphur butterfly (Colias tyche) female, Lapland, Finland, July.

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male, Lapland, Finland, July.

Jussi Murtosaari / Booth's Sulphur (Colias tyche) female feeding, Lapland, Finland, July.

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male, Lapland, Finland, July.

Jussi Murtosaari / Pale Clouded Yellow (Colias hyale) second generation female, central Finland, August.

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male and female, Joutsa (formerly Leivonmaki), Finland, July.

Claudio Contreras / Glaucous Cracker Butterfly (Hamadryas glauconome) Aldama, Tamaulipas, northeastern Mexico, August.

Thomas Marent / Pale Clouded Yellow (Colias hyale) butterfly, Switzerland

Thomas Marent / Pale Clouded Yellow (Colias hyale) butterfly, Switzerland

Hans Christoph Kappel / Pale Clouded Yellow Butterfly (Colias hyale) on leaves, Germany

PREMAPHOTOS / Pale cracker butterfly (Hamadryas glauconome) on a tree in tropical dry forest, Costa Rica

Nature Production / Eastern Pale Clouded Yellow butterfly {Colias erate poliographus} face, close-up, Asia

Nature Production / Eastern Pale Clouded Yellow {Colias erate poliographus} pupa, butterfly about to emerge, Japan

Nature Production / Eastern Pale Clouded Yellow {Colias erate poliographus} recently emerged from pupa, Japan

Mark Moffett / Imperial Hairstreak (Jalmenus evagoras) caterpillar tended by ant (Iridomyrmex anceps)

Pal Hermansen / Moorland clouded yellow butterfly (Colias palaeno) resting on a flower, Viken, Norway. July.

Guy Edwardes / Spotted fritillary (Melitaea didyma) larva/caterpillar, near Bratsigovo, Bulgaria June

Joel Sartore / Photo Ark / Multiband butterflyfish (Chaetodon multicinctus) portrait, Pure Aquariums. Captive, occurs in eastern central Pacific Ocean.

Joel Sartore / Photo Ark / Multiband butterflyfish (Chaetodon multicinctus) portrait, Pure Aquariums. Captive, occurs in eastern central Pacific Ocean.

Guy Edwardes / Common blue butterfly (Polyommatus icarus) female, rresting on dew-covered grass stem, Powerstock Common, Dorset, England, UK. May.

Paul Harcourt Davies / Brimstone butterfly (Gonepteryx rhamni) female, nectaring on flower, Podere Montecucco, Orvieto, Umbria, Italy. April.

Paul Harcourt Davies / Hermit butterfly (Chazara briseis) resting in dry grass, Umbria, Italy. September.

Paul Harcourt Davies / Berger's clouded yellow butterfly (Colias alfacariensis) female, nectaring on flower, Italy. June.

Paul Harcourt Davies / Cardinal fritillary butterfly (Argynnis pandora) nectaring on a flower, Gran Sasso, Abruzzo, Italy. July.

Paul Harcourt Davies / Lesser butterfly orchid (Platanthera bifolia) in flower, Sibillini, Umbria, Italy. May.

Paul Harcourt Davies / Lesser butterfly orchid (Platanthera bifolia) in flower, Sibillini, Umbria, Italy. May.

Bernard Castelein / Small white (Pieris rapae) butterfly resting on a leaf, Klein Schietveld Nature Reserve, Brasschaat, Belgium. July.

Bernard Castelein / Small white (Pieris rapae) butterfly resting on a leaf, Klein Schietveld Nature Reserve, Brasschaat, Belgium. July.

David Woodfall / Pearl-bordered fritillary butterfly (Boloria euphrosyne) feeding on flowers. Threatened species, pale form, Wales, UK.May.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno), male flying and female resting on flower.

Konrad Wothe / Pale clouded yellow (Colias hyale) female, Bavaria, Germany, August.

Robert Pickett / Owl Butterfly (Caligo memnon) caterpillar heads, Costa Rica