Espen Bergersen / Common raven (Corvus corax) pair in courtship display, flying upsidedown and calling, Hornoya bird cliff, Norway. March.

Jorma Luhta / Two Red squirrels {Sciurus vulgaris} on tree trunk, one going up, one coming down, Finland

Anup Shah / Sumatran Orang utan baby hanging upsidedown in tree {Pongo pygmaeus abelii} Gunung Leuser NP, Sumatra, Indonesia

David Fleetham / Upsidedown jellyfish (Cassiopea medusae) resting in water, Komodo, Indonesia.

Claudio Contreras / Upsidedown Jelly (Cassiopea frondosa), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January

Ingo Arndt / Goldenrod crab spider {Misumena vatia} Germany

Pete Oxford / Mangrove upsidedown jelly (Cassiopea xamachana) Lighthouse Reef Atoll, Belize.

Pedro Narra / Young Bornean Orangutan (Pongo pygmaeus) hanging upsidedown, Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia.

Markus Varesvuo / Bearded Tit (Panurus biarmicus) female amongst reeds collecting seeds, Finland

Alex Mustard / Harlequin shrimp (Hymenocera elegans) on blue sea star. This species of shrimps feeds on starfish, turning them upsidedown and keeping them as living larder. Bitung, North Sulawesi, Indonesia. Lembeh...

Pat Tuson / Transition Towns Stall surrounded by people with upsidedown bicycles in front, London Green Fair (previously Camden Green Fair) England UK, June 2011

Georgette Douwma / Upside down jellyfish (Cassiopeia andromeda) on sea bed, Rinca, Komodo National Park, Indonesia, October

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

Tim Laman / Upsidedown Jellyfish {Cassiopeia sp} in a mangrove lagoon amongst the roots of Red Mangrove trees. Tunicate Cove, Belize. This jellyfish has symbiotic algae in its tentacles and stays upside-down to p...

Ross Hoddinott / Small pearl-bordered fritillary {Boloria selene}, Marsland mouth, Cornwall / Devon, UK.

Dave Bevan / European nuthatch (Sitta europeae) feeding from fat feeder, Wales, January

Dave Bevan / Siskin (Carduelis spinus) male on nut feeder, UK

Jorma Luhta / Bean goose {Anser fabalis} somersault while washing back, Finland

Jorma Luhta / Bean goose {Anser fabalis} somersault while washing back, Finland

Jorma Luhta / Red squirrel {Sciurus vulgaris} climbing down tree, Finland

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} young monkeys playing in the sunshine in the trees, Jigokudani, Nagano, Japan

Inaki Relanzon / Lesser horseshoe bat {Rhinolophus hipposideros} roosting in cave, France

Nick Garbutt / Malachite Butterfly (Siproeta stelenes) forest near Napo River, Amazonia, Ecuador

Rolf Nussbaumer / Wildlife biologist banding, weighing and conducting research on Ferruginous Pygmy Owl {Glaucidium brasilianum} Willacy County, Rio Grande, Texas, USA 2007

Rolf Nussbaumer / European Suslik / Souslik {Spermophilus citellus}, adult diving into burrow, National Park Lake Neusiedl, Austria, April

Roger Powell / Red Wattlebird {Anthochaera carunculata} looking for food, Victoria, Australia

GEORGETTE DOUWMA / Blue triggerfish (Pseudobalistes fuscus) searching for food on coral reef, Red Sea, Egypt

Rolf Nussbaumer / Pine Siskin {Carduelis pinus} adult drinking, Hill Country, Texas, USA

Pete Oxford / Coquerel's sifaka (Propithecus coquereli) handing upsidedown feeding, Ankarafantsika Strict Nature Reserve, Western deciduous forest. MADAGASCAR endemic

Matthew Maran / Pygmy slow loris {Nycticebus pygmaeus) captive, Endangered Primate Rescue Center, Cuc Phuong National Park, Vietnam

Nature Production / Spider Monkey {Ateles sp} hanging down with its tail looped around a branch, San Diego Zoo, California, USA

David Shale / Deep sea medusa {Solmissus sp} Gulf of Maine, Atlantic

Shattil & Rozinski / Snowy egret {Egretta thula} preening underside of wing, Texas, USA

Simon Colmer / Tanzanian bush mantis (Polyspilota sp) Captive

Staffan Widstrand / Hyacinth macaw hanging up-side-down in tree, Brazil {Andodorhynchus hyacinthinus}

Anup Shah / Young Chimpanzee hanging upside-down from mother, Gombe NP, Tanzania 2003 'Tanga' + 'Tom'

Kim Taylor / Common Bluebottle Fly (Calliphora vomitoria) on ceiling. Digital composite, UK.

Kim Taylor / Water Boatman / Backswimmer (Notonecta glauca) at water surface, UK. Captive.

Flip Nicklin / Upside Down Catfish (Synodontis nigriventris) central Africa

Philippe Clement / European nuthatch {Sitta europaea} on Silver birch trunk Belgium

Francis Abbott / Upside down jellyfish (Cassiopeia andromeda) Pacific, Yap, Palau.

GEORGETTE DOUWMA / Violet / bubble raft snail hangs upsidedown from sea surface suspended by raft of mucous coated bubbles secreted by foot {Janthina janthina} Cape, South Africa.

Juergen Freund / Upsidedown jellyfish {Cassiopeia sp} + anemone in brackish water lake, Kalaban Is, Kalimantan, Indonesia. Anemones feed on jellyfish

John Cancalosi / Grey seal lying on its back {Halichoerus grypus}UK

Jane Burton / Black-and-white kitten playing with a Father Christmas hat.

Premaphotos / Daddy-long-legs / Rafter spider (Pholcus phalangioides) female holding eggs in her mouthparts, UK

Nature Production / Fairy Shrimp {Branchinella kugenumaensis} swimming upsidedown, Japan

Nature Production / Fairy Shrimp {Branchinella kugenumaensis}swimming upsidedown, May, Japan

David Hall / Upsidedown jellyfish {Cassiopeia andromeda} Papua New Guinea

Juergen Freund / Upsidedown jellyfish (Cassiopeia sp) Caribbean

David Hall / Upside down jellyfish {Cassiopeia frondosa} Dominica West Indies Symbiotic algae in

David Fleetham / Mangrove upsidedown jellyfish (Cassiopea xamachana), Florida, USA. This species mimics sea anemones by resting with its tentacles positioned on top when on the sea floor.

Tim Laman / Emperor Bird of Paradise (Paradisaea guillermi) male hanging upsidedown in a tree, part of display, Huon Peninsula, Papua New Guinea

David Fleetham / Upsidedown jellyfish (Cassiopea medusae) is resting bell down, tentacles up, on sandy bottoms off Wakaya Island, Fiji.