Ingo Arndt / Researcher Jim Lewis curator of the true bug collection at INBio, San Jose, Costa Rica

Mark Raycroft / Rottweiler (Canis familiaris) male and puppy

Mark Raycroft / Australian Kelpie (Canis familiaris) laying in grass

Mark Raycroft / Australian Cattle Dog (Canis familiaris) portrait

Mark Raycroft / Golden Retriever (Canis familiaris) portrait of a puppy sitting among firewood logs

Mark Raycroft / Golden Retriever (Canis familiaris) relaxing on lawn with a young girl

Mark Raycroft / Golden Retriever (Canis familiaris) puppies together with front paws up on a log

Mark Raycroft / Golden Retriever (Canis familiaris) portrait of a puppy sitting on a rock in garden

Pete Oxford / Marsupial Frog (Gastrotheca orophylax) in cloud the forest, Ecuador

Mitsuaki Iwago / Harp Seal (Phoca groenlandicus) resting on snow, Gulf of St Lawrence, Canada

Flip de Nooyer / Common Vole (Microtus arvalis) adult peering from burrow, Europe

Mitsuaki Iwago / African Lion (Panthera leo) three month old cub sleeping on mother's leg, Ngorongoro Conservation Area, Tanzania