Thomas Marent / Citrus Butterfly (Papilio demodocus) drinking minerals and salts from soil, Jozani National Park, Zanzibar, Tanzania

Petra Wegner / Chihuahuas, longhaired, two puppies, 9 weeks, sitting in a straw basket

Petra Wegner / Chihuahua, longhaired puppy, 9 weeks, standing portrait.

Petra Wegner / Chihuahua, longhaired puppy, 9 weeks, sitting portrait.

Stephen Dalton / Close up of eye of Domestic dog, Alsatian or German shepherd breed, UK

LYNN M. STONE / Portrait of female Doberman Pinscher sitting in yellow maple leaves, Illinois, USA

Rolf Nussbaumer / Giant swallowtail butterfly (Papilio cresphontes), adult feeding on Prairie Verbena (Glandularia bipinnatifida), Hill Country, Texas, USA. April

Rolf Nussbaumer / Giant swallowtail butterfly (Papilio cresphontes), chrysalis, broken branch mimicry, Hill Country, Texas, USA. August

Tony Wu / Orange basslets (Pseudanthias squamipinnis) with sea fans on top of the arch at The Doghouse dive site in Diving Dog Passage on the Barrier Reef of Papua New Guinea

Tony Wu / Orange basslets (Pseudanthias squamipinnis) with sea fans on top of the arch at The Doghouse dive site in Diving Dog Passage on the Barrier Reef of Papua New Guinea

Loic Poidevin / Citrus swallowtail (Papilio demodocus) captive occurs in Africa.

Alex Hyde / Caterpillar of the Citrus Swallowtail butterfly (Papillio demodocus). The caterpillar is a bird dropping mimic. Captive, originating from Africa.