Stephen Dalton / Chinese peacock butterfly {Papilio bianor} in flight, from Asia.

Stephen Dalton / Blue swallowtail butterfly {Papilio peranthus} in flight, from East Indies

Stephen Dalton / Swallowtail butterfly {Papilio pericles} in flight, from SE Asia

Bernard Castelein / Common Mormon butterfly (Papilio polytes) female, romulus morph mimicing the inedible Crimson rose butterfly, Gibbon Wildlife Sanctuary, Assam, India

Chien Lee / Rajah Brooke's Birdwing (Trogonoptera brookiana) males at a seep where they feed on salts, Gunung Mulu National Park, Sarawak, Malaysia

Chien Lee / Swallowtail (Papilionidae) caterpillar showing defensive behavior

Chien Lee / Swallowtail (Papilionidae) caterpillar showing defensive behavior

Fabio Liverani / Two Swallowtail (Papilio machaon) caterpillars on plant stem, Emilia Romagna Region, Italy

Fabio Liverani / Swallowtail butterfly (Papilio machaon) on Goosegrass, Emilia Romagna Region, Italy

Fabio Liverani / Swallowtail (Papilio machaon) caterpillar on plant stem, Emilia Romagna, Italy

Fabio Liverani / Swallowtail (Papilio machaon) caterpillar on plant stem, Emilia Romagna, Italy

Kevin Schafer / Swallowtail (Papilionidae) butterflies mating, Marojejy National Park, Madagascar

Tim Laman / Group of Swallowtail butterflies (Graphium sp) on beach. Bioko Island, Equatorial Guinea.

Tim Laman / Crimson Rose Swallowtail Butterfly (Atrophaneura hector) resting on leaf of a Heritiera mangrove tree. Sundarban Forest, Khulna Province, Bangladesh.

Guy Edwardes / Scarce swallowtail (Iphiclides podalirius) feeding on lavender, Provence, France

Jerry Monkman / Eastern tiger swallowtail butterfly {Papilio glaucus} Sabins Pasture, Vermont, USA

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly on flower, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly on Common Sunflower (Helianthus annuus), Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly on Common Sunflower (Helianthus annuus), Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly on a flower, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly on a flower, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly drying wings after emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) fully emerged, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) fully emerged, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) emerging, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly wing, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) on flower, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) pupa, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar pupating, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar feeding, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) egg, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar feeding, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) caterpillar, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Mountain Apollo (Parnassius apollo) butterfly on thistle, Hohe Tauern National Park, Austria

Rod Williams / Banded peacock / Emerald swallowtail (Papilio palinurus) captive, from South East Asia

Rod Williams / Female Batwing butterfly (Atrophaneura semperi) captive, from the Philippines

Rod Williams / Great mormon butterfly (Papilio memnon) captive, from SE Asia

Rod Williams / Male Batwing butterfly (Atrophaneura semperi) captive, from the Philippines

Kevin Schafer / Common Rose (Pachliopta aristolochiae) butterfly sipping salts and minerals from soil, Bhutan

Kerstin Hinze / Scarce swallowtail (Iphiclides podalirius) Romania

Kerstin Hinze / Scarce swallowtail butterfly (Iphiclides podalirius) Romania

Michael & Patricia Fogden / Helena Birdwing (Troides helena) butterfly, Tangkoko Batuangus Reserve, Sulawesi, Indonesia

Ingo Arndt / Swallowtail (Papilio sp) butterfly egg attached to the underside of leaf, Germany

Paul Hobson / Swallowtail butterfly, British race, {Papilio machaon britannicus} UK

Gary K. Smith / Swallowtail Butterfly {Papilio machaon ssp britannicus} feeding on Melancholy thistle, with windmill and habitat in background, Norfolk Broads, UK, June

Gary K. Smith / Swallowtail Butterfly {Papilio machaon ssp britannicus} feeding on Melancholy thistle, Norfolk Broads, UK, June

Thomas Marent / Common Rose (Pachliopta aristolochiae) butterfly, Erawan National Park, Thailand

Thomas Marent / Common Rose (Pachliopta aristolochiae) butterfly, Erawan National Park, Thailand

Thomas Marent / Butterfly (Eurytides sp) group sipping minerals from ground, Manu National Park, Peru

Silvia Reiche / Oldworld Swallowtail (Papilio machaon) butterfly wing, Hoogeloon, Netherlands

Silvia Reiche / Scarce Swallowtail (Iphiclides podalirius) butterfly male, St. Nazaire le Desert, France

Silvia Reiche / Scarce Swallowtail (Iphiclides podalirius) butterfly male, St. Nazaire le Desert, France

Silvia Reiche / Mountain Apollo (Parnassius apollo) butterfly on Meadow Clary (Salvia pratensis) flower, Netherlands

Solvin Zankl / Swallowtail butterfly (Papilio machaon) Germany

Ingo Arndt / Southern Festoon (Zerynthia polyxena) butterfly, Russia

Ingo Arndt / Southern Festoon (Zerynthia polyxena) butterfly, Russia

Michel Poinsignon / Swallowtail butterfly caterpillar (Papilio machaon), Lorraine, France

Ingo Arndt / Emperor Swallowtail (Papilio ophidicephalus) butterfly on flower, Africa

Ingo Arndt / Emperor Swallowtail (Papilio ophidicephalus) butterfly on flower, Africa

Ingo Arndt / Emerald Swallowtail (Papilio palinurus) butterfly, southern Asia

Ingo Arndt / Common Mormon (Papilio polytes) butterfly female, southern Asia

Ingo Arndt / Common Lime (Papilio demoleus) butterfly, southern Asia

Ingo Arndt / Oldworld Swallowtail (Papilio machaon) butterfly on flower, Europe

Ingo Arndt / Oldworld Swallowtail (Papilio machaon) butterfly on flower, Europe

Ingo Arndt / Common Lime (Papilio demoleus) butterfly wing detail showing false eyespot, Asia

Ingo Arndt / Common Lime (Papilio demoleus) butterfly feeding on flower, Asia

Hans Christoph Kappel / Swallowtail {Papilio machaon} close-up of wing

Hans Christoph Kappel / Common windmill butterfly {Atrophaneura polyeuctes} captive, Germany

Hans Christoph Kappel / Swallowtail butterfly caterpillar {Papilio machaon} feeding, captive

Albert Lleal / Oldworld Swallowtail (Papilio machaon) caterpillar foraging on a carrot stalk, Girona, Spain

Thomas Marent / Oldworld Swallowtail (Papilio machaon), Switzerland

Thomas Marent / Oldworld Swallowtail (Papilio machaon), Switzerland

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

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

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