Mark Taylor / Tabby kittens, Stanley and Fosset, 12 weeks, walking together in unison.

Roland Seitre / Atlantic Spotted Dolphin (Stenella frontalis) swimming in unison, seen from above. Azores.

Roland Seitre / Finless Porpoises (Neophocaena phocaenoides) swimming in unison. Captive. Endemic to South East Asia and the Yangtse River.

Konrad Wothe / European Bee-eater (Merops apiaster) trio calling, Bulgaria

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming close to surface during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Winfried Wisniewski / Sandhill Crane (Grus canadensis) pair flying, Bosque del Apache National Wildlife Refuge, New Mexico

Fred Bavendam / Pygmy Sweeper (Parapriacanthus ransonneti) school, Komodo Island, Indonesia

Suzi Eszterhas / Common Dolphin (Delphinus delphis) pair jumping, Baja California, Mexico

Suzi Eszterhas / Common Dolphin (Delphinus delphis) pair jumping, Baja California, Mexico

Donald M. Jones / Canada Goose (Branta canadensis) pair flying, central Montana

Hiroya Minakuchi / Beluga (Delphinapterus leucas) whale trio blowing toroidal bubble rings, play behavior, vulnerable, Shimane Aquarium, Japan

Winfried Wisniewski / Lesser Flamingo (Phoenicopterus minor) pair flying, Lake Nakuru National Park, Kenya

Scott Leslie / Fish group schooling, Bonaire, Caribbean

Flip Nicklin / Cavalla (Caranx sp) school off of Cocos Island, Costa Rica

Fred Bavendam / Striped Catfish (Plotosus lineatus) form amazingly dense schools for protection from predators, Forster-Tuncurry, New South Wales, Australia

Tim Fitzharris / Lesser Flamingo (Phoenicopterus minor) in a mass courtship display, Kenya

Konrad Wothe / Barn Swallow (Hirundo rustica) chicks lined up in nest with their mouths open waiting for food, Germany

Fred Bavendam / Crescent-tail Bigeye (Priacanthus hamrur), Lizard Island, Great Barrier Reef, Queensland, Australia

Fred Bavendam / Yellowfin Goatfish (Mulloides vanicolensis) often gather in large schools during the day but disperse at night to feed, Great Barrier Reef, Queensland, Australia

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) pair, Hawaii

Fred Bavendam / Diagonal-banded Sweetlips (Plectorhinchus lineatus) school, Loloata Resort, Papua New Guinea

Fred Bavendam / Bluestreak Fusilier (Pterocaesio tile) schooling, Coral Sea, Queensland, Australia

Tom Vezo / Sandhill Crane (Grus canadensis) pair flying, Bosque Del Apache National Wildlife Refuge, New Mexico

Carol Walker / Lusitano horse, men and woman riding stallions beside water, practising dressage steps, Portugal, May 2011, model released

Danny Green / 2020VISION / Whooper Swans (Cygnus cygnus) on snow calling in unison. Caerlaverock WWT, Scotland, Solway, UK, January.

Matthias Breiter / Pink Salmon (Oncorhynchus gorbuscha) swimming during migration, Indian River, Sitka, Alaska

Bjorn Forsberg / Two Canada Geese (Branta canadensis) calling in unison. Sweden, Europe, February.

Chien Lee / Termite (Hospitalitermes sp) workers carrying food, Bako National Park, Sarawak, Borneo, Malaysia

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming in fast current during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming in fast current during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream between forested banks during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Charlie Summers / Cheetah (Acinonyx jubatus) juvenile siblings drinking in unison at a Kgalagadi TB Park waterhole, Kwousant, South Africa

Charlie Summers / Pair of Rockhopper Penguins (Eudyptes chrysocome) braying in unison in courtship display, at their nesting site. Saunders Island in the Falkland Islands.

Thomas Marent / Termite group carrying pieces of wood, Tanjung Puting National Park, Borneo, Indonesia

Winfried Wisniewski / Brown Pelican (Pelecanus occidentalis) pair preening, San Diego, California

Winfried Wisniewski / Sandhill Crane (Grus canadensis) pair flying, Bosque del Apache National Wildlife Refuge, New Mexico

Winfried Wisniewski / Sandhill Crane (Grus canadensis) trio flying, Bosque del Apache National Wildlife Refuge, New Mexico

Murray Cooper / Chilean Flamingo (Phoenicopterus chilensis) pair flying, Ecuador

Murray Cooper / Yellow-eared Parrot (Ognorhynchus icterotis) trio flying, Colombia

Murray Cooper / Wood Stork (Mycteria americana) pair flying, Colombia

Hiroya Minakuchi / Northern Right Whale Dolphin (Lissodelphis borealis) pair jumping, Monterey Bay, California

Hiroya Minakuchi / Risso's Dolphin (Grampus griseus) pod, California

Ingo Arndt / Common Cranes (Grus grus) flock flying, Lake Hornborga, Sweden

Ingo Arndt / Common Cranes (Grus grus) flock flying, Lake Hornborga, Sweden

Ingo Arndt / Mule Deer (Odocoileus hemionus) doe and buck grazing, South Dakota

Ingo Arndt / Pacific Sardine (Sardinops sagax) school, California

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Ingo Arndt / Common Starling (Sturnus vulgaris) flock flying in formation to confuse hunting Peregrine Falcon (Falco peregrinus), Europe

Mark Moffett / Driver Ant (Dorylus nigricans) workers transporting huge numbers of their colony's pupae during emigration to a new nest site, Ghana

Fred Bavendam / Yellow-tailed Surgeonfish (Prionurus laticlavius) school, Ecuador

Fred Bavendam / Yellow and Blueback Fusilier (Caesio teres) school, Coral Sea, Australia

Fred Bavendam / Bluestripe Snapper (Lutianus kasmira) school, Bali, Indonesia

Fred Bavendam / Goldbelly Cardinalfish (Apogon apogonides) group hovering over aneomone tentacles, Ambon, Indonesia

Fred Bavendam / Crescent-tail Bigeye (Priacanthus hamrur) school, Lizard Island, Great Barrier Reef, Australia

Fred Bavendam / Crescent-tail Bigeye (Priacanthus hamrur) school, Lizard Island, Great Barrier Reef, Australia

Donald M. Jones / Canada Goose (Branta canadensis) pair flying, central Montana

ZSSD / Meerkat (Suricata suricatta) group of four standing in a line, native to Africa

Kevin Schafer / Grant's Gazelle (Nanger granti) three bucks, Tanzania

Michio Hoshino / Caribou (Rangifer tarandus) pair of males beside lake, Alaska

Konrad Wothe / Greater Flamingo (Phoenicopterus ruber) pair wading, Camargue, France

Kevin Schafer / Atlantic Salmon (Salmo salar) fry near Puerto Montt, part of an aquaculture program, Chile

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) group standing on rocky beach, Antarctic Bay, South Georgia Island

Yva Momatiuk & John Eastcott / Light-mantled Albatross (Phoebetria palpebrata) pair in synchronized mating flight above Allardyce Range, South Georgia Island

ZSSD / Red River Hog (Potamochoerus porcus) piglet trio, a highly social bush pig native to Africa, San Diego Zoo, California

Jan Vermeer / Emperor Penguin (Aptenodytes forsteri) lone adult with group of chicks, Snow Hill Island, Antarctica

Jan Vermeer / Emperor Penguin (Aptenodytes forsteri) group tobogganing, Antarctica

Hiroya Minakuchi / Beluga (Delphinapterus leucas) whale trio blowing toroidal bubble rings, play behavior, vulnerable, Shimane Aquarium, Japan

Michael Quinton / Emperor Goose (Anser canagicus) group in water, Alaska

Ross and Diane Armstrong / Chevron Barracuda (Sphyraena putnamiae) schooling in Kimbe Bay, Papua New Guinea

Scott Leslie / Fish group schooling, Bonaire, Caribbean

Scott Leslie / Sand Lance (Ammodytes sp) group swimming, Nova Scotia, Canada

Scott Leslie / Sand Lance (Ammodytes sp) group swimming, Nova Scotia, Canada

Fred Bavendam / Striped Catfish (Plotosus lineatus) school, Bali, Indonesia

Ingo Arndt / Snow Goose (Chen caerulescens) pair flying, Bosque del Apache National Wildlife Refuge, New Mexico

Ingo Arndt / Great White Pelican (Pelecanus onocrotalus) group fishing, Lake Nakuru, Kenya

ZSSD / Red-tailed Hawk (Buteo jamaicensis) and Common Raven (Corvus corax) flying, North America

Tom Vezo / Mallard (Anas platyrhynchos) male and two females flying, Arizona

Tom Vezo / Red Knot (Calidris canutus) flock flying, Rio Grande Valley, Texas

Tom Vezo / Royal Tern (Thalasseus maximus) trio flying over water, Rio Grande Valley, Texas

Tom Vezo / Royal Tern (Thalasseus maximus) pair on beach, Rio Grande Valley, Texas

Flip Nicklin / Orca (Orcinus orca) pair jumping, Sea World, San Diego, California

Chris Newbert / Bigeye Trevally (Caranx sexfasciatus) school, 40 feet deep, Solomon Islands

Chris Newbert / Barracuda (Sphyraena sp) school, 50 feet deep, Solomon Islands

Ingo Arndt / Gelada Baboon (Theropithecus gelada) adult males, grooming, Simien Mountain National Park, Ethiopia

Suzi Eszterhas / Blue Wildebeest (Connochaetes taurinus) herd gathers in preparation of crossing the Mara River during migration, Masai Mara National Reserve, Kenya

Hiroya Minakuchi / Bigeye Trevally (Caranx sexfasciatus) school swimming off Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Pink Salmon (Oncorhynchus gorbuscha) swimming upstream during spawning season, Prince William Sound, Alaska

Hiroya Minakuchi / Pink Salmon (Oncorhynchus gorbuscha) spawning upstream, Prince William Sound, Alaska

Hiroya Minakuchi / Pink Salmon (Oncorhynchus gorbuscha) spawning upstream, Prince William Sound, Alaska

Pete Oxford / Burchell's Zebra (Equus burchellii) herd drinking from waterhole, Africa

Pete Oxford / Cape Buffalo (Syncerus caffer) herd on the move, Africa

Konrad Wothe / Snow Goose (Chen caerulescens) trio flying during migration, Bosque del Apache National Wildlife Refuge, New Mexico

Konrad Wothe / Snow Goose (Chen caerulescens) pair flying during migration, Bosque del Apache National Wildlife Refuge, New Mexico

Konrad Wothe / Snow Goose (Chen caerulescens) pair flying over wetland, Bosque del Apache National Wildlife Refuge, New Mexico

Konrad Wothe / Snow Goose (Chen caerulescens) flock flying during migration, Bosque del Apache National Wildlife Refuge, New Mexico

Konrad Wothe / Snow Goose (Chen caerulescens) pair flying, Bosque del Apache National Wildlife Refuge, New Mexico