Male black wildebeest (white-tailed gnu (Connochaetes gnou) calling, Mountain Zebra National Park, South Africa, Africa

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

Southern elephant seal (Mirounga leonina) male roaring, Sea Lion Island, Falkland Islands, South Atlantic, South America

Southern elephant seal (Mirounga leonina) male roaring, Sea Lion Island, Falkland Islands, South America

Southern elephant seal (Mirounga leonina) male on a sandy beach, Sea Lion Island, Falkland Islands, South America

A tufted gray langur (Semnopithecus priam) showing a threat display in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

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

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

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

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

Adult spotted hyena (Crocuta crocuta) in Serengeti National Park, Tanzania, East Africa, Africa

Adult spotted hyena (Crocuta crocuta), with wildebeests in Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Adult yellow-rumped caciques (Cacicus cela), at nest site on Belluda Cano, Amazon Basin, Loreto, Peru, South America

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

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

An adult black-collared hawk (Busarellus nigricollis), Nauta Cano, Pacaya-Samiria Reserve, Peru, South America

Red Deer, Killarney National Park, County Kerry, Munster, Republic of Ireland, Europe

Bull moose (Alces alces), close up with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

Bull moose (Alces alces) close up in laughing pose, Grand Teton National Park, Wyoming, United States of America, North America

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

A male lion (Panthera leo), Serengeti National Park, Tanzania, East Africa, Africa

A male lion (Panthera leo), Serengeti National Park, Tanzania, East Africa, Africa

Gentoo penguin (Pygoscelis papua) vocalizing on snow with red algae, Antarctica, Polar Regions

Gentoo peguin vocalizing, Antarctica, Polar Regions

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

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

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

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

Alpine Marmot, Marmota marmota

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

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

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

Snowy Owls (Nyctea scandiaca), three fledglings calling

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)

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

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

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

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

Young Snowy Owl (Bubo scandiacus, Nyctea scandiaca)

Digital nomad with laptop on veranda of tiny log house

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Eagle Owl (Bubo bubo) in flight

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

Bald Eagle (Haliaeetus leucocephalus), juvenile

Bull elk (Cervus canadensis) with misty breath in winter, Denver, Colorado, 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

Screaming penguin, Antarctic Peninsula, Antarctica

Gentoo penguins on rock, Antarctica

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

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

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

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

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

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

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

Red Deer (Cervus elaphus) bellowing, UK

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

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

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

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

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