Terry Whittaker / Grey heron ( Ardea cinerea) flying to bin. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Yva Momatiuk & John Eastcott / Burchell's Zebra (Equus burchellii) herd Blue Wildebeest (Connochaetes taurinus) and Thomson's Gazelles (Eudorcas thomsonii) congregate near crossing, Mara River, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Atlantic Puffin (Fratercula arctica) adults congregate in colony on coastal cliff during summer breeding season, Newfoundland, Canada

Franco Banfi / Camp with tents on beach in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate every summer. Primorsky Krai, Russia. August 2019.

Franco Banfi / Photographic equipment ready inside tent in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate every summer. Primorsky Krai, Russia. August 2019.

Franco Banfi / Diving fins resting against tent on beach with coniferous forest in background. In Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate in summer. Primorsky Krai, Russia. August 2019.

Franco Banfi / Outdoor kitchen on camp in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate in summer. Primorsky Krai, Russia. August 2019.

Franco Banfi / Sauna hut / banja and logpile at camp in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate every summer. Primorsky Krai, Russia. August 2019.

Franco Banfi / Drawing of Whale in sand, beach in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate every summer. Primorsky Krai, Russia. August.

Franco Banfi / Camp on beach at full moon, in Vrangel Bay where Bowhead whale (Balaena mysticetus) congregate during summer. Primorsky Krai, Russia. August 2019.

Heather Angel / Long-horned bee (Eucera sp.), two crawling into Wild gladiolus (Gladiolus atroviolaceus) flower to roost at night. Turkey. May.

Terry Whittaker / Grey herons ( Ardea cinerea) scavenging from bin. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish, Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey Heron ( Ardea cinerea). Amsterdam, Netherlands. April. Heron congregate around the fish stalls as city markets are closing, picking up scraps of food.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Terry Whittaker / Grey heron ( Ardea cinerea) scavenging fish. Herons congregate around the fish stalls as city markets are closing, picking up scraps of food. Amsterdam, Netherlands. April.

Ashley Cooper / Striped necked terrapins (Mauremys caspica) in a river in Skala Eresou, Lesvos, Greece. June.

Ashley Cooper / Starling (Sturnus vulgaris) murmuration flying to roost near Kendal Cumbria, England, UK. January 2007

Steven Kazlowski / Polar bears (Ursus maritimus) with female and cub in background, congregate on newly formed pack ice where a Bowhead whale (Balaena mysticetus) carcass has been left by Inupiaq subsistence whalers, 10...

Colin Monteath / Shy Albatross (Thalassarche cauta) group congregate around fishing vessel, New Zealand

Sergey Gorshkov / Brown Bear (Ursus arctos) group foraging for salmon, normally solitary they may congregate at fishing rivers, Kamchatka, Russia

Jane Burton / Wood Ants (Formica rufa) congregate on top of nest mound in early spring. UK.

Sergey Gorshkov / Brown Bear (Ursus arctos) group foraging for salmon, normally solitary they may congregate at fishing rivers, Kamchatka, Russia

Yva Momatiuk & John Eastcott / Northern Fur Seal (Callorhinus ursinus) non-territorial bulls and sub-adult males congregate on haul out beach, St Paul Island, Pribilof Islands, Alaska

Harry Collins / Brown bear (Ursus arctos) feeding on a Sockeye salmon (Oncorhynchus nerka) in a shallow river. Glacous-winged gulls (Larus glaucescens) fly into frame and congregate around the bear. Katmai, Alaska, A...

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the coast, before going to sea. Right Whale Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, and then go to sea. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate to rest, while a flock of South Georgia pintail (Anas georgica georgica) fly overhead. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguin (Aptenodytes patagonicus) chicks congregate in a small creche. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate in winding columns seeking shelter, as winds blow spindrift and a blizzard sets in. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate in winding columns seeking shelter, as winds blow spindrift and a blizzard sets in. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate in winding columns seeking shelter, as winds blow spindrift and a blizzard sets in. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate in winding columns seeking shelter, as winds blow spindrift and a blizzard sets in. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate in winding columns seeking shelter, as winds blow spindrift and a blizzard sets in. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, as winds obscure the scene with spindrift. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go to sea, as storm winds obscure the birds with wind driven spindrift. St Andrew's Bay, South Georgia Isla...

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go into the sea. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go to sea. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go to sea. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go to sea. St Andrew's Bay, South Georgia Island

Ben Cranke / King penguins (Aptenodytes patagonicus) congregate on the beach, seeking a safe point to go into the sea, with male Southern elephant seals (Mirounga leonina) blocking their path. St Andrew's Bay,...

Karine Aigner / Aerial view Bekalikali Bai,Salonga National Park. Bais, or forest clearings, offer open space to congregate and access to water for elephants and other animals. Salonga National Park, Democratic Repu...