Thomas Marent / Oldworld Swallowtail (Papilio machaon) emerged from chrysalis, Switzerland

Thomas Marent / Oldworld Swallowtail (Papilio machaon) caterpillar forming chrysalis, Switzerland

Thomas Marent / Oldworld Swallowtail (Papilio machaon) caterpillar, Switzerland

Thomas Marent / Mountain Apollo (Parnassius apollo) on flower, Switzerland

Thomas Marent / Mountain Apollo (Parnassius apollo) butterfly close-up, showing 'eye' used as mimic to confuse predators, Switzerland

Thomas Marent / Oldworld Swallowtail (Papilio machaon), Switzerland

Thomas Marent / Common Green Birdwing (Ornithoptera priamus) butterfly, Papua New Guinea

Dan Burton / Great mormon butterfly {Papilio memnon} Devon, UK

Steven David Miller / Orchard butterfly {Papilio aegeus} on flowers and leaves, Melbourne zoo, Australia

Hans Christoph Kappel / Swallowtail butterfly {Papilio machaon} chrysalis, Germany

Juan Manuel Borrero / Swallowtail butterfly {Papilio machaon} on flower. Catalonia, Spain

Hans Christoph Kappel / Swallowtail butterfly caterpillar {Papilio machaon} making chrysalis, Germany

Steven David Miller / Blue triangle butterfly (Graphium sarpedon) on leaves, Melbourne zoo, Australia, captive

Steven David Miller / Orchard butterfly {Papilio aegeus} on leaves, Melbourne zoo, Australia

Peter Scoones / False eye / great mormon caterpillar (Papilio memnon) larva on twig.

Rolf Nussbaumer / Chrysalis of Pipevine Swallowtail butterfly {Battus philenor} just before butterfly emerges, Hill Country, Texas, USA, sequence 1/3

Rolf Nussbaumer / Pipevine Swallowtail butterfly {Battus philenor} butterfly emerging from chrysalis, Hill Country, Texas, USA, sequence 2/3

Rolf Nussbaumer / Pipevine Swallowtail butterfly {Battus philenor} butterfly emerging from chrysalis, Hill Country, Texas, USA, sequence 3/3

Rolf Nussbaumer / Two-Tailed Swallowtail {Papilio multicaudata} on Texas Buckeye (Aesculus glabra) Hill Country, Texas, USA

Rolf Nussbaumer / Pipevine Swallowtail butterfly {Battus philenor} Hill Country, Texas, USA

Rolf Nussbaumer / Black Swallowtail butterfly {Papilio polyxenes} adult on Prairie Verbena (Verbena bipinnatifida) Hill Country, Texas, USA

Doug Wechsler / Black Swallowtail butterfly {Papilio polyxenes} resting on Goldenrod, Pennsylvania, USA

Tim Fitzharris / Black Swallowtail (Papilio polyxenes) butterfly caterpillar on wild daylily, North America

PREMAPHOTOS / Caterpillar larva of Great mormon swallowtail butterfly (Papilio memnon) mimicking a bird dropping, osmaterium extruded in defense secreting a foul smelling substance, Sulawesi

PREMAPHOTOS / Caterpillar larva of King swallowtail butterfly (Papilio sp) resembling a bird dropping, extruding its osmaterium which releases a foul smelling secretion, rainforest, Panama

PREMAPHOTOS / Caterpillar larva of King swallowtail butterfly (Papilio sp) resembling a bird dropping, extruding its osmaterium which releases a foul smelling secretion, rainforest, Venezuela

Nature Production / Chinese Windmill {Atrophaneura / Byasa alcinous alcinous} chrysalis overwintering, Japan

Nature Production / Yellow Swallowtail butterfly {Papilio machaon hippocrates}

Nature Production / Yellow Swallowtail butterfly {Papilio machaon hippocrates} feeding on flower nectar, probosics extended

Steven David Miller / Australian birdwing butterfly {Ornithoptera priamus} male, captive, Australia

Michael Durham / Swallowtail (Papilionidae) butterfly held by eight year old Isabel before release in the coastal mountains of Oregon

Tom Vezo / Western Tiger Swallowtail (Papilio rutulus) butterfly on wildflower, North America

Tom Vezo / Western Tiger Swallowtail (Papilio rutulus) butterfly on wildflower, North America

Nature Production / Common Mormon butterfly {Papilio polytes polytes} sucking nectar from Common Lantana flowers, Okinawa, Japan

Nature Production / Caterpillar larva (third stage) of Chinese Yellow Swallowtail Butterfly {Papilio xuthus} captive, Japan

Nature Production / Chrysalises of Chinese Windmill butterfly {Atrophaneura / Byasa alcinous alcinous} overwintering, Saitama, Japan

Nature Production / Chinese Yellow Swallowtail Butterfly {Papilio xuthus} courtship, Japan

Nature Production / Larva of Chinese Yellow Swallowtail Butterfly {Papilio xuthus} recently hatched, feeding on egg shell, Japan

Nature Production / Old World Yellow Swallowtail butterfly {Papilio machaon hippocrates} male sucking nectar from Thistle {Cirsium oligophyllum} Saitama, Japan

Nature Production / Caterpillar larva (fourth stage) of Chinese Yellow Swallowtail Butterfly {Papilio xuthus} captive, Japan

Barry Bland / Swallowtail butterfly {Papilio machaon} caterpillar on its food plant Milk parsley (Peucedanum palustre)Norfolk, England

Doug Wechsler / Spicebush swallowtail butterfly caterpillar going to chrysalis stage (Papilio troilus) Philadelphia, USA

Pete Oxford / King swallowtail butterfly (Papilio thoas) captive, Amazonia, Ecuador

Bernard Castelein / Caterpillar larva of Swallowtail butterfly (Papilio machaon) France

Tom Vezo / Giant swallowtail butterfly (Papilio cresphontes) Ontario, Canada

Steven David Miller / Caterpillar larva of Giant swallowtail butterfly (Papilio cresphontes) with defensive 'eye' marking, catpive, Florida, USA

Pete Oxford / Butterfly chrysalis (Parides vertumnus) attached to plant stem, Amazonia, Ecuador

Kerstin Hinze / Swallowtail (Papilio machaon) butterfly caterpillar starting pupation by attaching itself to a branch, Sardinia, Italy

Jose B. Ruiz / Swallowtail butterfly {Papilio machaon} caterpillar climbing up plant, Spain

Michael Durham / Western Tiger Swallowtail (Papilio rutulus) butterfly, flying over Smooth Hawksbeard flowers (Crepis capillaris), Oregon

Michael Durham / Western Tiger Swallowtail (Papilio rutulus) butterfly, flying over Smooth Hawksbeard flowers (Crepis capillaris), Oregon

Pete Oxford / Asian Swallowtail (Papilio demodocus) butterfly, found throughout the island, Madagascar

Philippe Clement / Close-up of feeding Swallowtail butterfly caterpillar {Papilio machaon} La Brenne, France

Philippe Clement / Close-up of feeding Swallowtail butterfly caterpillar {Papilio machaon} La Brenne, France

Philippe Clement / Swallowtail butterfly caterpillar {Papilio machaon}, La Brenne, France

Philippe Clement / Close-up of feeding Swallowtail butterfly caterpillar {Papilio machaon} La Brenne, France

Kim Taylor / Cattleheart butterfly {Parides eurimedes} feeding on Lantana flower, Trinidad, West Indies.

Kim Taylor / Cattleheart butterfly {Parides eurimedes} flying, Trinidad, West Indies.

Jose B. Ruiz / Swallowtail butterfly {Papilio machaon} with wings spread, Spain.

Jose B. Ruiz / Swallowtail butterfly {Papilio machaon} larva metamorphosing into pupal stage, Spain.

Nick Garbutt / Adult male Rajah Brooke's birdwing butterfly{Trogonoptera / Troides brookiana} drinking from edge of rainforest puddle, Dipterocarp rainforest, Danum Valley, Sabah, Borneo.

Steven David Miller / Ulysses butterfly {Papilio ulysses} Resting on leaf showing wing underside, Coffs Harbour, New South Wales, Australia.

Steven David Miller / Ulysses Butterfly {Papilio ulysses} close-up underside of wing, Coffs Harbour, New South Wales, Australia.

John F.Burton / Swallowtail butterfly {Papilio machaon} on flowers in windowbox, Eppelheim, Germany

Jose B. Ruiz / Swallowtail butterfly {Papilio machaon} eggs on plant, Spain.

Jose B. Ruiz / Two Swallowtail butterflies {Papilio machaon} feeding on plants, Spain.

Jose B. Ruiz / Swallowtail butterfly {Papilio machaon} caterpillar feeding on plant, Spain.

Steven David Miller / Male Australian birdwing butterfly {Ornithoptera priamus} Western Australia

Jose B. Ruiz / Scarce swallowtail butterfly {Iphiclides podalirius} resting on branch with flowers, Spain.

Steven David Miller / Palamedes swallowtail butterfly {Papilio palamedes} wings closed, USA

Steven David Miller / Australian birdwing butterfly {Ornithoptera priamus} male on flower. Captive. Australia.

Duncan Mcewan / Swallowtail butterfly close-up of head showing coiled proboscis.

Bernard Castelein / Swallowtail butterfly caterpillar {Papilio machaon} France

Hans Christoph Kappel / Swallowtail butterfly caterpillar about to pupate {Papilio machaon} Germany

Luiz Claudio Marigo / Hector's swallowtail butterfly {Papilio hectorides} atlantic rainforest, Brazil.

Doug Wechsler / Male Tiger swallowtail {Papilio glaucus} feeding on Buddleia flowers, Pennsylvania, USA.

Paul Hobson / Swallowtail butterfly {Papilio machaon} Norfolk, England

Steve Knell / Swallowtail butterfly {Papilio machaon} on Flag iris, Norfolk, England.

Paul Hobson / Swallowtail butterfly {Papilio machaon} Norfolk, England

Robin Chittenden / Long tailed blue butterfly {Lampides boeticus} UK, threatened

Kim Taylor / Swallowtail Butterfly (Papilio machaon) caterpillar feeding on fennel, UK. Captive.

Jane Burton / Rajah Brooke's Birdwing Butterfly (Trogonoptera brookiana) Digital composite.

Jane Burton / Citrus Swallowtail {Papilio demodocus} newly emerged from pupa. Africa. Captive

Hans Christoph Kappel / Swallowtail butterfly chrysalis. Life cycle sequence (6) Pupa

Hans Christoph Kappel / Swallowtail butterfly caterpillar pupating. Life cycle sequence (5) Larva pupating. Captive

Hans Christoph Kappel / Swallowtail butterfly caterpillar pupating Life cycle sequence (4) Larva pupating.

Hans Christoph Kappel / Swallowtail butterfly caterpillar pupating. Life cycle sequence (3) Larva beginning to pupate .

Hans Christoph Kappel / Swallowtail Butterfly egg. Life cycle sequence (1).

George McCarthy / Swallowtail butterfly chrysalis {Papilio machaon} UK

Doug Wechsler / Tiger swallowtail butterfly (Papilio glaucas) feeding. Philadelphia, USA

Duncan Mcewan / Swallowtail butterfly close-up of head showing extended proboscis, Summer, UK

Bernard Castelein / Scarce swallow-tailed butterfly {Iphiclides podalirius} Belgium

Steven David Miller / Giant swallowtail butterfly larva (Papilio cresphontes) USA (C) Naples, Florida - snake mimic

Hans Christoph Kappel / Swallowtail butterfly (Papilio machaon) on flower. Germany, Europe

John F.Burton / Swallowtail butterfly on window box flowers. Near Heidelberg, Germany