Terry Whittaker / 2020VISION / Swallowtail Butterfly (Papilio machaon britannicus) on hawkbit flower. Strumpshaw Fen, Norfolk, June.

Terry Whittaker / 2020VISION / Swallowtail Butterfly (Papilio machaon britannicus) on hawkbit flower. Strumpshaw Fen, Norfolk, June.

Tom Vezo / Luzon Peacock Swallowtail (Papilio chikae) butterfly, Tucson Botanical Gardens, Tucson, Arizona

Tom Vezo / Swallowtail (Papilionidae) butterfly on girl's hand, Tucson Botanical Gardens, Tucson, Arizona

Tom Vezo / Emperor Swallowtail (Papilio ophidicephalus) butterfly, Tucson Botanical Gardens, Tucson, Arizona

Tom Vezo / Malay Cruiser (Vindula dejone) butterfly, Tucson Botanical Gardens, Tucson, Arizona

Tom Vezo / Luzon Peacock Swallowtail (Papilio chikae) butterfly, Tucson Botanical Gardens, Tucson, Arizona

Hiroya Minakuchi / Great Mormon (Papilio memnon) butterfly, Malaysia

Hiroya Minakuchi / Great Mormon (Papilio memnon) butterfly emerging from chrysalis, Malaysia

Hiroya Minakuchi / Great Mormon (Papilio memnon) butterfly drying wings after emerging from chrysalis, Malaysia

Hiroya Minakuchi / Golden Birdwing Butterfly (Troides amphrysus) emerging from chrysalis, Malaysia

Hiroya Minakuchi / Golden Birdwing Butterfly (Troides amphrysus) emerging from chrysalis, Malaysia

Barry Mansell / Tailed jay butterfly (Graphium agamemnnon) from Southeast Asia. Captive

Dave Watts / Female Cairns birdwing butterfly (Ornithoptera euphorion) on leaf, Wet Tropics World Heritage Rainforest, North Queensland, Australia, November

Pete Oxford / Swallowtail (Papilionidae) caterpillar pupating, Yasuni National Park, Amazon, Ecuador

Pete Oxford / Swallowtail (Papilionidae) caterpillar pupating, Yasuni National Park, Amazon, Ecuador

Martin Willis / Clearwing Swallowtail (Cressida cressida) male feeding on flower, Coastal dunes, Townsville, Queensland, Australia

Konrad Wothe / Emperor Swallowtail (Papilio ophidicephalus) butterfly, Mahale Mountains National Park, Tanzania

Konrad Wothe / Small Striped Swordtail (Graphium policenes) and Nymphalid Butterfly (Nymphalidae) feeding on flower nectar, Mahale Mountains National Park, Tanzania

Konrad Wothe / Small Striped Swordtail (Graphium policenes) butterflies sipping minerals on shore, Lake Tanganyika, Mahale Mountains National Park, Tanzania

Piotr Naskrecki / Swallowtail (Papilionidae) caterpillar, New Britain, Papua New Guinea

Stephen Dalton / Tailed jay butterfly (Graphium agamemnon) Malaysia

Stephen Dalton / Emerald swallowtail butterfly (Papilio palinurus) captive, from SE Asia

ZSSD / Cattleheart (Parides sp) butterfly, native to the Americas

Rod Williams / Chequered / Lime Swallowtail Butterfly (Papilio demoleus). Captive. Endemic to Thailand. UK, June.

MYN / Paul Harcourt Davies / Caterpillar larva of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larva of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

MYN / Paul Harcourt Davies / Caterpillar larvae of Southern festoon butterfly (Zerynthia polyxena cassandra) on foodplant (Aristolochia rotundifolia) Italy, May. meetyourneighbours.net project

LYNN M. STONE / Praying mantis (Mantis religiosa) feeding on a Spicebush swallowtail butterfly (Papilio troilus) on a thistle, Durham, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on Butterfly weed (Asclepias tuberosa) Old Saybrook, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on thistle plant, Durham, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on Butterfly weed (Asclepias tuberosa) flowers, Old Saybrook, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on Butterfly weed (Asclepias tuberosa) flowers, Old Saybrook, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on Butterfly weed (Asclepias tuberosa) flowers, Old Saybrook, Connecticut, USA, August

LYNN M. STONE / Spicebush swallowtail butterfly (Papilio troilus) feeding on Butterfly weed (Asclepias tuberosa) flower, Old Saybrook, Connecticut, USA, August

Christian Ziegler / Thoas Swallowtail (Papilio thoas) caterpillar mimicking bird dropping, Barro Colorado Island, Panama

Alex Hyde / Common Swallowtail butterfly (Papilio machaon) feeding on Meadow Clary (Salvia pratensis) flowers. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Common Swallowtail butterfly (Papilio machaon) wing close up showing detail of scales. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Common Swallowtail butterfly (Papilio machaon) resting on Meadow Clary (Salvia pratensis) flowers, backlit. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Wide angle view of Common Swallowtail Butterfly (Papilio machaon) on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Wide angle view of Common Swallowtail Butterfly (Papilio machaon) resting on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitud...

Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) resting on Viper's Bugloss / Blueweed (Echium vulgare) in alpine meadow. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) basking in light with wings open on a white background. Nordtirol, Tirol, Austrian Alps, Austria, 1700 metres altitude, July.

Alex Hyde / Common Swallowtail Butterfly (Papilio machaon) with wings spread on a white background. Nordtirol, Tirol, Austrian Alps, 1700 metres altitude, July.

Ernie Janes / Man photographing Swallowtail butterfly (Papilio machaon) UK, June

Ernie Janes / Swallowtail butterfly (Papilio machaon) on flower, Norfolk, UK, June

Ernie Janes / Swallowtail butterfly (Papilio machaon) in flower border, Norfolk Broads, UK, June

Ernie Janes / Man photographing Swallowtail butterfly (Papilio machaon) UK, June

Stephen Dalton / Scarce Swallowtail Butterfly (Papilio / Iphiclides podalirius) on flowers. Umbria, Italy, April.

Stephen Dalton / Scarce Swallowtail Butterfly (Papilio / Iphiclides podalirius) on flowers. Umbria, Italy, April.

Stephen Dalton / Scarce Swallowtail Butterfly (Papilio / Iphiclides podalirius) on flowers. Umbria, Italy, April.

Adrian Davies / British Swallowtail Butterfly (Papilio machaon) at rest. UK, July.

B&S Draker / Pipevine Swallowtail Butterfly (Battus philenor) adult feeding on Texas thistle. Sinton, Corpus Christi, Coastal Bend, Texas, USA, May.

Rolf Nussbaumer / Black Swallowtail Butterfly (Papilio polyxenes) male on Strawberry Hedgehog Cactus (Echinocereus enneacanthus). Laredo, Webb County, Texas, USA, April.

Nature Production / Chrysalis of Red helen swallowtail butterfly (Papilio helenus nicconicolens) Japan

Nature Production / Child touching caterpillar larva of Chinese Yellow Swallowtail Butterfly (Papilio xuthus) osmeterium exposed in defence, Japan

Nature Production / Caterpillar larva of Red helen swallowtail butterfly (Papilio helenus nicconicolens) Japan

Nature Production / Caterpillar larva of Swallowtail butterfly (Graphium doson) last instar, Japan

Pete Oxford / Red-spotted Swallowtail Butterfly (Papilio anchisiades). Napo River bordering Yasuni National Park, Amazon Rainforest, Ecuador.

Nature Production / Swallowtail butterflies (Papilio macilentus) visiting Autumn Olive flowers (Elaeagnus umbellata) Kirishima, Kagoshima, Japan, May

Florian Möllers / Male Citrus Swallowtail (Papilio demodocus) in high grass. Budongo Forest Reserve, Masindi, Uganda, Africa, December

Florian Möllers / Caterpillar (rufous larval phase) of Emperor swallowtail butterfly (Papilio / Princeps ophidicephalus) with inflated osmeterium to scare off predators. Budongo Forest Reserve, Masindi, Uganda, Africa....

Chien Lee / Fivebar Swordtail (Graphium antiphates) and Common Jay (Graphium doson) butterflies feeding on minerals on riverbank, Gunung Mulu National Park, Malaysia

Chien Lee / Common Mormon (Papilio polytes) caterpillar showing false eyespots, Kuching, Borneo, Malaysia

Chien Lee / Common Mormon (Papilio polytes) caterpillar mimicking bird dropping, Kuching, Borneo, Malaysia

Chien Lee / Rajah Brooke's Birdwing (Trogonoptera brookiana) pupa, Kipandi Butterfly Park, Crocker Range, Malaysia

Chien Lee / Golden Birdwing Butterfly (Troides amphrysus) caterpillar defends itself by means of foul-smelling tentacles hidden behind its head, Kipandi Butterfly Park, Crocker Range, Malaysia

Chien Lee / Birdwing Butterfly (Troides andromache) caterpillar prepares for its moult into the pupal stage, Kipandi Butterfly Park, Crocker Range, Malaysia

Chien Lee / Rajah Brooke's Birdwing (Trogonoptera brookiana) caterpillar entering pupal stage, Kipandi Butterfly Park, Crocker Range, Malaysia

Bernard Castelein / African swallowtail butterfly (Papilio dardanus) at rest on leaves, Jozani Chwaka Bay NP, Zanzibar, Tanzania

Thomas Marent / Swallowtail (Papilionidae) caterpillar showing false eyespots, Cameron Highlands, Malaysia

Thomas Marent / Rajah Brooke's Birdwing (Trogonoptera brookiana) butterfly male in rainforest, Cameron Highlands, Malaysia

Thomas Marent / Rajah Brooke's Birdwing (Trogonoptera brookiana) butterfly male, Cameron Highlands, Malaysia

Thomas Marent / Rajah Brooke's Birdwing (Trogonoptera brookiana) butterfly males, Cameron Highlands, Malaysia

Thomas Marent / Rajah Brooke's Birdwing (Trogonoptera brookiana) butterfly male and female, Cameron Highlands, Malaysia

Thomas Marent / Swallowtail Butterfly (Graphium sarpedon) feeding on minerals in sand, Gunung Leuser National Park, northern Sumatra, Indonesia

Thomas Marent / Swallowtail Butterfly (Graphium sarpedon) feeding on minerals in sand, Gunung Leuser National Park, northern Sumatra, Indonesia

Thomas Marent / Green Dragontail (Lamproptera meges) butterfly, Gunung Leuser National Park, northern Sumatra, Indonesia

Thomas Marent / Green Dragontail (Lamproptera meges) butterfly, Gunung Leuser National Park, northern Sumatra, Indonesia

Thomas Marent / Tailed Jay Butterfly (Graphium agamemnon) feeding on minerals in soil, Tanjung Puting National Park, Borneo, Indonesia

Konrad Wothe / Common Green Birdwing (Ornithoptera priamus) male feeding on flower nectar, Atherton Tableland, Queensland, Australia

Konrad Wothe / Common Green Birdwing (Ornithoptera priamus) butterfly male, Atherton Tableland, Queensland, Australia

Edwin Giesbers / Tailed jay butterfly (Graphium agamemnon) at rest with wings open

Edwin Giesbers / Lemon / Common lime swallowtail butterfly (Papilio demoleus) at rest on leaf.

Edwin Giesbers / Tailed jay butterfly (Graphium agamemnon) close-up of wing scales

LYNN M. STONE / European Praying Mantis (Mantis religiosa) feeding on a Tiger Swallowtail Butterfly (Papilio glaucus) in a cluster of Ironweed (Vernona altissima) flowers. Connecticut, USA

LYNN M. STONE / Eastern Tiger Swallowtail butterfly (Papilio glaucus), male, feeding on nectar of Pink Thistle, Illinois, USA

LYNN M. STONE / Eastern Tiger Swallowtail butterfly (Papilio glaucus), dark phase female, on Pink Thistle in tallgrass prairie remnant, Illinois, USA (an intermediate phase between the typical yellow and the entirely...

LYNN M. STONE / Black Swallowtail butterfly (Papilio polyxenes) at rest on leaves in meadow, Illinois, USA

LYNN M. STONE / Black Swallowtail butterfly (Papilio polyxenes) at rest on leaves in meadow, Illinois, USA

Hiroya Minakuchi / Tailed Jay Butterfly (Graphium agamemnon), Philippines