Will Watson / Short-fringed mining bee (Andrena dorsata) resting on Dandelion (Taraxacum officinale) flower, Herefordshire, England, UK, April.

Harry Collins / American alligator (Alligator mississippiensis) lowering body into water and bellowing to create water droplets before raising body out of water, Florida, US, April.

Joel Sartore / Photo Ark / Marbled newt (Triturus marmoratus) close up of abdomen, Conservation Fisheries, a breeding center for rare native stream fish. Captive, occurs in Western Europe.

Harry Collins / American alligator (Alligator mississippiensis) vibrating abdomen whilst submerging body and bellowing in courtship, Florida, April.

Orsolya Haarberg / Walrus (Odobenus rosmarus) resting, flipper detail, Hinlopenstretet, Svalbard, Norway.

Joel Sartore / Photo Ark / Jamaican iguana (Cyclura collei) scales and spine detail, Indianapolis Zoo. Captive, occurs in Jamaica. Critically endangered.

David Weiller / Bagworm moth caterpillar (Psychidae) defecating fecal pellet (frass) from its lower opening. The larvae lies hidden within its coccon casing, decorated with pieces of leaf to protect and disguise itse...

Edwin Giesbers / Close up of Blue-banded morpho butterfly (Morpho achilles) wing detail. Captive.

Edwin Giesbers / Close up of Swallowtail butterfly (Papilio machaon) abdomen and wings. The Netherlands. July.

Nick Upton / Female Silvery leafcutter bee (Megachile leachella) returning to her burrow in coastal dunes with mass of pollen attached to the hairs under her abdomen to stick her brood cells with, Dorset, UK. July...

Paul Harcourt Davies / Female Tarantula wolf spider (Lycosa tarantula) carrying her egg sac, containing more than 100 eggs, beneath her abdomen attached to her spinnerets, Lazio, Italy. September.

Bruce Thomson / Jewel / Christmas spider (Austracantha minax) endemic spider with distinctive spines on abdomen, female moving along her strand of web, Toowoomba, Queensland. Australia.