David Pattyn / Black necked grebe (Podiceps nigricollis) frontal view of pair mating, La Dombes lake area, France, April

Chris Mattison / Giraffe necked weevils (Trachelophorus giraffa) male. Endemic to Andasibe, Madagascar.

David Pattyn / Red necked grebe (Podiceps grisegena) approaching a competitor in an attempt to drive him away during the courting season, Danube area, Bulgaria, April

Rolf Nussbaumer / Black-necked stilt (Himantopus mexicanus) pair displaying, Dinero, Lake Corpus Christi, South Texas, USA.

Ernie Janes / Long necked woman with many neck rings, belonging to Padaung Tribe, Thailand

Steve Gettle / Ring-necked Duck (Aythya collaris) male flying, Island Lake Recreation Area, Michigan

Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar of Fairy Duster (Calliandra sp) flower in cloud forest, Tandayapa Valley, western slope of Andes, Ecuador

Murray Cooper / White-necked Jacobin (Florisuga mellivora) male feeding on flower nectar, Ecuador

Alex Hyde / Giraffe necked weevil {Trachelophorus giraffa} male on leaf of host plant (Dichaetanthera cordifolia) tropical rainforest, Mantadia NP, Madagascar

Alex Hyde / Giraffe necked weevil {Trachelophorus giraffa} male photographed on white background, tropical rainforest, Andasibe-Mantadia National Park, Madagascar

Juan Manuel Borrero / Side-necked Terrapin (Podocnemis unifilis) hatchlings in the hand, and ready to be released. Pacaya Samiria National Reserve. Amazon Basin. Loreto. Peru

Donald M. Jones / Eared Grebe (Podiceps nigricollis) mother carrying newborn chick, central Montana

Nick Garbutt / Male Giraffe-necked Weevil (Trachelophorus giraffa) Montane rainforest, Vohiparara, Ranomafana National Park, Madagascar.

Michel Roggo / Yellow-spotted river turtle (Podocnemis unifilis), Los Lagos, Beni, Bolivia, October.

Andy Sands / Yellow-necked mouse (Apodemus flavicollis) climbing among Hawthorn berries, Captive, UK.

Stephen Dalton / Yellow necked mouse (Apodemus flavicollis) in potting shed. England, UK

Inaki Relanzon / Portrait of a Padaung women (Giraffe Neck women) with many neck rings in Inle Lake, Shan State, Myanmar, Burma. August 2009

Inaki Relanzon / Padaung women (Giraffe Neck women) wearing neck rings, weaving, Inle Lake, Shan State, Myanmar, Burma. August 2009

Gerrit Vyn / Adult Red-necked Grebes (Podiceps grisegena) in breeding plumage performing "whinny-braying" duet in defense of territory. Fairbanks, Alaska, USA, July.

LYNN M. STONE / Domestic dog, German short-haired pointer retrieving a dead male Ring-necked pheasant, Connecticut, USA

Donald M. Jones / Black-necked Stilt (Himantopus mexicanus) feeding in a small pond, central Montana

Stephen Dalton / Yellow-necked mouse {Apodemus flavicollis} controlled conditions, UK

David Shale / Deepsea Narrow-necked oceanic eel {Derichthys serpentinus} from between 188 and 507m in the Mid-Atlantic Ridge, North Atlantic Ocean

Wild Wonders of Europe / Bergmann / Red-necked phalarope (Phalaropus lobatus) on water silhouetted, Thingeyjarsyslur, Iceland, June 2009

Wild Wonders of Europe / Bergmann / Red-necked phalarope (Phalaropus lobatus) on water, silhouetted, Thingeyjarsyslur, Iceland, June 2009

Sebastian Kennerknecht / Ring-necked Duck (Aythya collaris) drake in breeding plumage calling, Santa Cruz, Monterey Bay, California

Kim Taylor / Giraffe necked weevil (Trachelophorus giraffa) male, captive, Madagascar

Orsolya Haarberg / Red-necked phalarope (Phalaropus lobatus). Mvatn, Iceland. June 2008

Tim Laman / Rufous-necked hornbill (Aceros nipalensis) perched on branch, Huai Kha Khaeng Wildlife Sanctuary, Thailand. IUCN Vulnerable

Tim Laman / Various seeds of rainforest trees regurgitated by Rufous-necked Hornbill (Aceros nipalensis). Huai Kha Khaeng Wildlife Sanctuary, Thailand.

Inaki Relanzon / Male (right) and female Giraffe necked weevils (Trachelophorus giraffa) on leaf, Ranomafana National Park, Madagascar

Kim Taylor / Yellow-necked Mice (Apodemus flavicollis) feeding on peanut bird feeder at night. Surrey, UK

Thomas Marent / Red-necked Wallaby (Macropus rufogriseus) mother with baby, Bunya Mountains National Park, Australia

Hanne & Jens Eriksen / Red necked stint {Calidris ruficollis}, breeding plumage, Anadyr, Siberia, Russia

Hanne & Jens Eriksen / Red necked stint {Calidris ruficollis}, winter plumage, Samut Sakhon, Thailand

Rolf Nussbaumer / Black necked stilt {Himantopus mexicanus} pair mating, Welder Wildlife Refuge, Sinton, Texas, USA

Gabriel Rojo / Black necked swan {Cygnus melancoryphus} Patagonia, Argentina

Gabriel Rojo / Buff necked ibis {Theristicus caudatus} Lanin NP, Argentina

Gabriel Rojo / Black necked swan {Cygnus melancoryphus} Patagonia, Argentina

Rhonda Klevansky / Buff necked ibis {Theristicus caudatus} Torres del Paine NP, Chile

Michael & Patricia Fogden / White-necked Jacobin (Florisuga mellivora) hummingbird male feeding on nectar from a Bromeliad flower, La Selva Biological Research Station, Rainforest, Costa Rica

Tom Vezo / Black-necked Stilt (Himantopus mexicanus) foraging for food, California

Flip de Nooyer / Black-necked Aracari (Pteroglossus aracari) a toucanet, perching on branch, Pantanal, Brazil

Michael Quinton / Red-necked Grebe (Podiceps grisegena) parent on nest with eggs in boreal pond, Alaska

Tui De Roy / Black-necked Swan (Cygnus melancoryphus) group swimming, Puerto Natales, Chilean Fjords, Chile

Tim Fitzharris / Black-necked Stilt (Himantopus mexicanus) wading through reeds, North America

Gabriel Rojo / Black necked swans with cygnets {Cygnus melancoryphus} Argentina

Hermann Brehm / Black necked grebe (Podiceps nigricollis) adult brings food to chicks on mate's back, Germany

Pete Oxford / Flap necked chameleon catching fly with tongue, Africa

Pete Oxford / Side necked terrapins (Podocnemis unifilis) on log. Amazonia, Ecuador, Central America

Markus Varesvuo / Red-necked Phalarope (Phalaropus lobatus) landing on water, Komagvaer, Norway, June

Alex Hyde / Giraffe Necked Weevil (Trachelophorus giraffa) male on leaf of Dichaetanthera cordifolia. Tropical rainforest, Mantadia National Park, Madagascar.

Alex Hyde / Giraffe Necked Weevil (Trachelophorus giraffa) male on leaf of Dichaetanthera cordifolia. Tropical rainforest, Mantadia National Park, Madagascar.

Hermann Brehm / Buff-necked ibis (Theristicus caudatus hyperorius) foraging, Mato Grosso do sul, Brazil

Hermann Brehm / Grey-necked Wood-rail (Aramides cajanea), Pantanal, Brazil

David Pattyn / Black necked grebe (Podiceps nigricollis) pair chasing away another grebe in a territorial dispute, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male jumping on top of the female to mate, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male jumping on top of the female to mate, La Dombes lake area, France April

David Pattyn / Black necked grebe (Podiceps nigricollis) pair courting in preparation to mate, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male dancing on top of the head of the female after mating, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) pair mating at the edge of a lake, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) pair performs a dance after mating in which they mimick each other's movements, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) one pair mating while another couple is watching and waiting its turn to mate on the same spot, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) pair mating, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male jumping on top of the head of the female after mating, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) flapping its wings, La Dombes lake area, France, April

David Pattyn / Black-necked Grebes (Podiceps nigricollis) mating on water. La Dombes lake area, France April.

Danny Green / Black-necked Grebe (Podiceps nigricollis), in summer plumage. Netherlands, Holland, April.

Danny Green / Black-necked Grebe (Podiceps nigricollis) in summer plumage on water. Netherlands, Holland, April.

Danny Green / Black-necked Grebe (Podiceps nigricollis) in summer plumage on water. Netherlands, Holland, April.

Kevin Schafer / Buff-necked Ibis (Theristicus caudatus) in palm tree, Pantanal, Brazil

Floris van Breugel / Northern / Hen Harrier (Circus cyaneus) attempts catching a wild Ring-necked Pheasant (Phasianus colchicus) Klamath National Wildlife Refuge, California, USA, December

Claudio Contreras / Eared Grebe (Podiceps nigricollis), Bahia de los Angeles Biosphere Reserve, Gulf of California, Baja California Peninsula, Mexico, December.

Hanne & Jens Eriksen / Brown-necked raven (Corvus ruficollis) two in flight, Oman, March

Hanne & Jens Eriksen / Brown-necked raven (Corvus ruficollis) chicks in nest, Oman, March

Donald M. Jones / Ring-necked Pheasant (Phasianus colchicus) male, National Bison Range, Moise, Montana

David Pattyn / Red necked grebes (Podiceps grisegena) performing typical courtship dance whilst calling, Danube area, Bulgaria, April

David Pattyn / Red necked grebe (Podiceps grisegena) head profile portrait, Danube area, Bulgaria, April

David Pattyn / Red necked grebe (Podiceps grisegena) portrait, Danube area, Bulgaria, April

David Pattyn / Red necked grebe (Podiceps grisegena) portrait, Danube area, Bulgaria, April

David Pattyn / Red necked grebes (Podiceps grisegena) performing their typical courtship dance, Danube area, Bulgaria, April

David Pattyn / Red necked grebe (Podiceps grisegena) in early morning mist, Danube area in Bulgaria, April

David Pattyn / Black necked grebe (Podiceps nigricollis) is chasing away another grebe while trying to keep a mating spot for itself. A lot of mating attempts fail because different grebe-couples disturb each other...

David Pattyn / Black necked grebe (Podiceps nigricollis) male jumping on top of the head of the female just after mating where he will then perform a dance on top of her head, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male bringing nest material to a spot where the couple will mate, to make himself more attractive, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male is jumping on top of the head of the female after mating to perform a dance on her head, La Dombes lake area, France, April

David Pattyn / Black necked grebes (Podiceps nigricollis) mating after sunset, La Dombes lake area, France, April

David Pattyn / Black necked grebe (Podiceps nigricollis) male trying to mount on top of the female during their mating ritual, La Dombes lake area, France, April

David Pattyn / Black necked grebes (Podiceps nigricollis) pair in courtship dance during the mating season, with another pair infront, La Dombes lake area, France, April

David Pattyn / Black necked grebes (Podiceps nigricollis) mating on a misty morning, the male is jumping over the female just at the end of copulation, La Dombes lake area, France, April

David Pattyn / Black necked grebes (Podiceps nigricollis) pair in courtship dance during the mating season, La Dombes lake area, France, April

David Pattyn / Black necked Grebes (Podiceps nigricollis) looking for some kind of shelter for the cold and the rain, La Dombes lake area, France, June (2008 was a very cold and wet summer)

Chris Mattison / Red bellied short neck turtle (Emydura subglobosa), captive, from New Guinea

Chris Mattison / Red bellied short neck turtle (Emydura subglobosa), captive juvenile, occurs New Guinea

Chris Mattison / Red-bellied short-necked turtle (Emydura subglobosa), captive, occurs in Papua New Guinea

Tui De Roy / Black-necked stilt (Himantopus mexicanus) in shallow coastal lagoon. Santa Cruz Island, Galapagos, June.