Male black grouse (Lyrurus tetrix) fighting on snow covered field, Finland

African skimmers (Rynchops flavirostris) displaying, Chobe National Park, Botswana, Africa

Female mantled howler monkey (Alouatta palliata) known for its loud call, eating in Pacific coast forest, Esperanza, Nosara, Guanacaste, Costa Rica

Female mantled howler monkey (Alouatta palliata) known for its loud call, eating in Pacific coast forest, Esperanza, Nosara, Guanacaste, Costa Rica

Juvenile mantled howler monkey (Alouatta palliata) in Pacific coast forest, known for their loud call, Esperanza, Nosara, Guanacaste, Costa Rica

Juvenile mantled howler monkey (Alouatta palliata) in Pacific coast forest, known for their loud call, Esperanza, Nosara, Guanacaste, Costa Rica

Beautiful blue and yellow Macaw in rainforest, The Maldives, Indian Ocean

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Magellanic penguin (Spheniscus magellanicus) calling, giving a warning call, Patagonia, Chile, South America

Mundari boy drumming to call back the cows, Mundari tribe, South Sudan, Africa

Adult austral thrush (Turdus falklandii falklandii), in the tussock grass on Carcass Island in the Falkland Islands, South America

Nazca booby (Sula grantii) downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Antarctic fur seal bull (Arctocephalus gazella) on South Georgia, Southern Ocean, Polar Regions

Yellow-footed gull (Larus livens), on its nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

Mantled Howler Monkey (Alouatta palliata), named for its call, eating leaves in tree, Nosara, Guanacaste Province, Costa Rica, Central America

Mourning Dove (Zenaida macroura),a member of the dove family, Columbidae, named after its mournful call, Bermuda, North Atlantic, North America

Mundari man drumming to call back the cows, Mundari tribe, South Sudan, Africa

Magellanic penguin (Spheniscus magellanicus) calling, giving a warning call, Patagonia, Chile, South America

Mantled Howler Monkey (Alouatta palliata), named for its call, eating leaves in tree, Nosara, Guanacaste Province, Costa Rica, Central America

Elephant seal on the beach giving warning call, at Sea Lion Island in The Falkland Isles

Bald eagle, haliaeetus leucocephalus, weisskopfseeadler, homer, kenai peninsula, alaska, usa

European wolf, wolf, canis lupus lupus, adult, in winter, national park bayrischer wald, germany, captiv

European wolf, canis lupus lupus, adult male howling, in winter, national park bayrischer wald, germany, captiv

Bald eagle, haliaeetus leucocephalus, weisskopfseeadler, homer, kenai peninsula, alaska, usa

Alpine Marmot, Marmota marmota

Bald eagle, haliaeetus leucocephalus, weisskopfseeadler, homer, kenai peninsula, alaska, usa

Bald eagle, haliaeetus leucocephalus, weisskopfseeadler, homer, kenai peninsula, alaska, usa

Chinstrap penguin (Pygoscelis antarctica) chick head detail at colony on Useful Island near the Antarctic Peninsula. There are an estimated 2 million breeding pairs of chinstrap penguins in the Antarctic peninsula region alone, perhaps as many as 7.5 million breeding pairs in all of Antarctica. Their name derives from the narrow black band under their heads which makes it appear as if they are wearing black helmets, making them one of the most easily identified types of penguin. Other names for them are "Ringed Penguins", "Bearded Penguins", and "Stonecracker Penguins" due to their harsh call. They grow to 68 cm (27 in). The average adult weight of a Chinstrap Penguin is 4.5 kg (10 lbs). Weight can range from 3 to 6 kg (6.6-13.2 lbs), with males being slightly larger and weight varying based on where the penguin is in the breeding cycle. Their diet consists of krill, shrimp, and fish. On land they build circular nests from stones, and lay two eggs, which are incubated by both the male and the female for shifts of five to ten days. They can also breed on icebergs, though they prefer non-icy conditions. The chicks hatch after about 35 days, and have fluffy gray backs and white fronts. The chicks stay in the nest for 20?30 days before they go to join a creche. At around 50?60 days old, they moult, gaining their adult plumage and go to sea. The Chinstrap Penguin was first described by German naturalist Forster in 1781. Its specific epithet was often seen as antarctica, however a 2002 review determined the genus Pygoscelis was masculine, and hence the correct binomial name is Pygoscelis antarcticus.

Siamang, (Symphalangus syndactylus), adult calling, captive, Southeast Asia

Siamang, (Symphalangus syndactylus), adult calling on tree, Southeast Asia, Asia

Snowy Owls (Nyctea scandiaca), two fledglings callingtdoors, outside, ornithology, zoology, color, colour

Toco Toucan (Ramphastos toco), adult, on tree, Pantanal, Brazil, South America

Northern White-cheeked Gibbon (Hylobates leucogenys), female adult calling in tree, Asia

Snowy Owls (Nyctea scandiaca), three fledglings calling

Snowy Owl, Arctic Owl, Great White Owl, Harfang (Bubo scandiacus) (Nyctea scandiaca), calling

Siamang (Symphalangus syndactylus, Hylobates syndactylus), calling female with young, native of Asia, in captivity, Czech Republic, Europe

Young Snowy Owl (Bubo scandiacus, Nyctea scandiaca)

Cougar or Puma (Puma concolor, Felis concolor), adult, with mouth open, snow, Montana, USA

Bald eagle (Haliaeetus leucocephalus), immature, calling, found in North America, captive, Germany, Europe

Siamang (Symphalangus syndactylus, Hylobates syndactylus), male calling, native of Asia, in captivity, Czech Republic, Europe

Great Gray Owl (Strix nebulosa), adult, portrait, calling, Germany, Europe

Snowy Owls (Nyctea scandiaca), three fledglings calling

Great Grey Owl or Lapland Owl (Strix nebulosa), adult, portrait, calling, Germany, Europe

A deer on a hillside calling out while rutting season with a backdrop of distant mountains, Red deer (Cervus elaphus), Wildpark Aurach, Austria, Europe

Young European Starlings (Sturnus vulgaris)

Black grouse, also blackgame or blackcock (Lyrurus tetrix) courting male, Hedmark, Norway, Europe

Harp Seal or Saddleback Seal (Pagophilus groenlandicus, Phoca groenlandica), pup on pack ice, Magdalen Islands, Gulf of Saint Lawrence, Quebec, Canada, North America

Western capercaillie (Tetrao urogallus), during courtship, calling, animal portrait, Berchtesgadener Land, Bavaria, Germany, Europe

Western capercaillie (Tetrao urogallus), during the courtship display in the snow, Salzburger Land, Austria, Europe

Western capercaillie (Tetrao urogallus), during the courtship display in the snow, Salzburger Land, Austria, Europe

African penguin (Spheniscus demersus), adult, calling, spreading wings, Boulders Beach, Simon's Town, Western Cape, South Africa, Africa

Puffin (Fratercula arctica), standing on grass, calling, bird rock Latrabjard, Westfjords, Iceland, Europe

Crane (grus grus) trumpeting at the courtship display in spring, call, courtship display, Vaestergoetland, Sweden, Europe

Silhouette of Grey Common cranesn (grus grus), pair of animals, courtship at sunrise, dance of the cranes, Vaestergoetland, Sweden, Europe

Pheasant (Phasianus colchicus), mating male, flapping wings, calling, Blankenfelde, Germany, Europe

Pheasant (Phasianus colchicus), calling male, courtship, flapping wings, fluttering, Blankenfelde, Germany, Europe

Calling Eurasian eagle-owl (Bubo bubo) in a birch tree, Sauerland, Germany, Europe

Pheasant (Phasianus colchicus), calling male, courtship display, flapping wings, fluttering, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

African penguin (Spheniscus demersus), adult, on land, calling, mating, Betty's Bay, Stony Point Nature Reserve, Western Cape, South Africa, Africa

Black grouse, also blackgame or blackcock (Lyrurus tetrix) courting male, Hedmark, Norway, Europe

Alpine marmot (Marmota marmota), calling, portrait, Hohe Tauern National Park, Carinthia, Austria, Europe

Digital nomad with laptop on veranda of tiny log house

Golden eagle (Aquila chrysaetos) adult bird calling on a heather moorland, England, United Kingdom, Captive, Europe

New Zealand fur seal (Arctocephalus forsteri), young animal on rock, Kaikoura, Canterbury, South Island, New Zealand, Oceania

Young white-tailed eagles (Haliaeetus albicilla) sitting in a meadow in winter landscape, calling, Kutno, Poland, Europe

Calling redshank (Tringa totanus) on a pasture stile, Germany, Europe

Pheasant (Phasianus colchicus), calling, Lower Saxony, Germany, Europe

Red-necked grebe (Podiceps grisegena) male calling, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

Snowy owl (Nyctea scandiaca), sitting on a snowy rock, calling, adult, captive, Czech Republic, Europe

Red kite (Milvus milvus) adult bird calling whilst standing on grassland, England, United Kingdom, Europe

Snow Owl (Bubo scandiacus, Nyctea scandiaca) calling

Common crane (Grus grus), duet call, Guenzer Seewiesen, spring migration, Necklenburg-Western Pomerania, Germany, Europe

Western marsh-harrier (Circus aeruginosus), female calling on tree stump, Toledo Province, Castilla- La Mancha, Spain, Europe

Red kite (Milvus milvus) adult bird calling whilst standing on grassland, England, United Kingdom, Europe

Eagle Owl (Bubo bubo) in flight

Bald Eagle (Haliaeetus leucocephalus), juvenile

Bull elk (Cervus canadensis) with misty breath in winter, Denver, Colorado, United States of America

Mighty Bald eagle (Haliaeetus leucocephalus) giving alarm calls while in flight letting everyone know he's near by, Anchor Point, Alaska, United States of America

Bull elk (Cervus canadensis) bugling in a field, Denver, Colorado, United States of America

Bull elk (Cervus canadensis) bugling, Denver, Colorado, United States of America

Red deer (Cervus elpahus) in the mullein forest during bellowing in the rain on the island of Jura, Scotland.

Cape Sugarbird (Promerops cafer), calling in territorial display, Western Cape, South Africa, July

Preying on Gentoo Penguins (Pygoscelis papua) hovering over colony.. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

European Starling (Sturnus vulgaris) nagging, Vosges du Nord Regional Nature Park, France

Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Fight. Seagull (Larus sp) facing Hooded Crow (Corvus cornix). Slovakia

Big male of chimpanzee (Pan troglodytes) on mangrove branches. Republic of the Congo. Conkouati-Douli Reserve.

Female chimpanzee (Pan troglodytes) with a baby on mangrove trees. Republic of the Congo. Conkouati-Douli Reserve.

Green Honeycreeper (Chlorophanes spiza) confronting a Saffron-crowned Tanager (Tangara xanthocephala), Colombia

Black grouse (Lyrurus tetrix) fights at dawn in a peat bog, Finland

Red deer (Cervus elaphus) stag in the mist, England

Red deer;Cervus elaphus) stag amongst bracken, England

Red Deer (Cervus elaphus) bellowing, UK

Ring-necked pheasant (Phasianus colchicus) calling on a manure pile in the early morning, Alsace, France

Portrait of Steller's sea eagle (Haliaeetus pelagicus) close up. Shiretoko National Park. Shiretoko Peninsula. Hokkaido. Japan

Red-winged Blackbird (Agelaius phoeniceus) male singing on a cattail in a marsh, Saguenay lac St Jean region, Quebec, Canada

Puffin (Fratercula artica) calling on a cliff, Island of Mailand, Scotland

European Ground Squirrel (Spermophilus citellus) alert on its hind legs, Romania

Atlantic Puffin (Fratercula arctica) displaying, Skomer island, Pembrokeshire, Wales

White-tailed eagle (Haliaeetus albicilla) on a pine tree, Flatanger, Norwegian Sea, Norway