Donald M. Jones / Canada Goose (Branta canadensis) pair flying, central Montana
Scott Leslie / Fish group schooling, Bonaire, Caribbean
Winfried Wisniewski / Lesser Flamingo (Phoenicopterus minor) pair flying, Lake Nakuru National Park, Kenya
Hiroya Minakuchi / Beluga (Delphinapterus leucas) whale trio blowing toroidal bubble rings, play behavior, vulnerable, Shimane Aquarium, Japan
Konrad Wothe / Barn Swallow (Hirundo rustica) chicks lined up in nest with their mouths open waiting for food, Germany
Tim Fitzharris / Lesser Flamingo (Phoenicopterus minor) in a mass courtship display, Kenya
Fred Bavendam / Bluestreak Fusilier (Pterocaesio tile) schooling, Coral Sea, Queensland, Australia
Fred Bavendam / Striped Catfish (Plotosus lineatus) form amazingly dense schools for protection from predators, Forster-Tuncurry, New South Wales, Australia
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
Fred Bavendam / Diagonal-banded Sweetlips (Plectorhinchus lineatus) school, Loloata Resort, Papua New Guinea
Flip Nicklin / Cavalla (Caranx sp) school off of Cocos Island, Costa Rica
Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) pair, Hawaii
Nick Garbutt / RF - Grant's zebra (Equus quagga boehmi), five drinking in unison at water hole following heavy rainfall. Ngorongoro Conservation Area, Serengeti National Park, Tanzania. (This image may be licens...
Nick Upton / Mute swan (Cygnus olor) pair preening in unison, Gloucestershire, UK, December.
Pedro Narra / Bottlenose dolphin (Tursiops truncatus) two porpoising in unison, Sado Estuary, Portugal
Nick Upton / Mediterranean gull (Larus melanocephalus) pair courting on lake shore, walking in unison and head-bowing, Gloucestershire, UK, June
Loic Poidevin / Great white pelican (Pelecanus onocrotalus), two flying in unison. Black Sea, Danube Delta, Romania. May.
Nick Upton / Common / Eurasian crane (Grus grus) pair bugling in unison to enforce their territorial claims as a third bird false preens, a threat display and often a prelude to aggression, Gloucestershire, UK, Fe...
Mark Carwardine / Humpback whales (Megaptera novaeangliae) three blowing / spouting at surface in unison, Southeast Alaska, USA August
Nick Upton / Common / Eurasian crane (Grus grus) pair Monty and Chris released by the Great Crane Project, bugling in unison on partially flooded pastureland to proclaim ownership of their territory, Slimbrigde, G...
Nick Upton / Great crested grebe pair (Podiceps cristatus) courting on the surface of a lake, calling quietly and head shaking in unison, Corsham Court, Wiltshire, England, UK, March.
Charlie Summers / Black-tailed prairie dogs (Cynomys ludovicianus) chirping in unison from atop a burrow. Wind Cave, South Dakota, USA, September.
Nick Upton / 2020VISION / Three year old Common / Eurasian cranes (Grus grus) 'Monty', 'Chris' and 'Ruby', released by the Great Crane Project, bugling in unison as Sedge walks away and 'Wendy' watches, on flooded pastureland,...
Nick Upton / 2020VISION / Three year old Common / Eurasian cranes (Grus grus) 'Monty', 'Chris' and 'Ruby', released by the Great Crane Project bugling in unison as Wendy watches, on flooded pastureland, Gloucestershire, UK, Ap...
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.
Bjorn Forsberg / Two Canada Geese (Branta canadensis) calling in unison. Sweden, Europe, February.
Charlie Summers / Pair of Rockhopper Penguins (Eudyptes chrysocome) braying in unison in courtship display, at their nesting site. Saunders Island in the Falkland Islands.
Charlie Summers / Cheetah (Acinonyx jubatus) juvenile siblings drinking in unison at a Kgalagadi TB Park waterhole, Kwousant, South Africa