David Perpinan / Oystercatcher (Haematopus ostralegus) incubating eggs on nest, alarm calling as a predator flies overhead, Scotland,UK, June.

Wild Wonders of Europe / Benvie / Alpine marmot (Marmota marmota) giving an alarm call, Guillestre, Queyras, France, June 2009

Jeff Vanuga / Arctic fox (Vulpes lagopus) flushing Common eider duck (Somateria mollissima) female from nest in colony. Svalbard, Norway. June.

Sandesh Kadur / Sambar (Rusa unicolor) alarm calling, Ranthambore National Park, Rajasthan, India. 2016.

John Cancalosi / Black-tailed prairie dog (Cynomys ludovicianus) alarm, South Dakota, USA, June.

John Cancalosi / Black-tailed prairie dog (Cynomys ludovicianus) alarm, South Dakota, USA, June.

John Cancalosi / Black-tailed prairie dog (Cynomys ludovicianus) alarm, South Dakota, USA, June.

John Cancalosi / Black-tailed prairie dog (Cynomys ludovicianus) alarm, South Dakota, USA, June.

John Cancalosi / Eastern american chipmunk (Tamias striatus) calling, avian predator alarm call, New York, USA, August.

John Cancalosi / Eastern american chipmunk (Tamias striatus) scratching, grooming and calling, avian predator alarm call, New York, USA, August.

Frederique Olivier / Kirk's dik-dik (Madoqua kirkii) alert and looking around, stamping, Serengeti NP, Tanzania.

Ingo Arndt / Alpine marmot giving alarm call {Marmota marmota} Hohe Tauern NP, Austria

Jen Guyton / Fork-tailed drongo (Dicrurus adsimilis) hovers over a foraging Meerkat (Suricata suricatta). The drongo will imitate the alarm call of other birds and then swoop down and steal the food the meerkat ha...

Cyril Ruoso / Alpine marmot (Marmota marmota) standing on hind legs and giving alarm call in Spring snow, Alps 2000m, France, June.

Gerrit Vyn / Black-bellied Plover (Pluvialis squatarola) female in breeding plumage giving alarm call, Yukon Delta National Wildlife Refuge, Alaska, USA June.

Gerrit Vyn / Black-bellied Plover (Pluvialis squatarola) female in breeding plumage giving alarm call, Yukon Delta National Wildlife Refuge, Alaska, USA June.

Gerrit Vyn / Semipalmated Sandpiper (Calidris pusilla) giving alarm call, Yukon Delta National Wildlife Refuge, Alaska, USA June

Ingo Arndt / European Ground Squirrel (Spermophilus citellus) giving alarm call, Lake Neusiedl, Austria

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Gray-tailed tattler (Tringa brevipes) in breeding plumage giving alarm call to warn its chicks. Chukotka, Russia. July.

Gerrit Vyn / Great knot (Calidris tenuirostris) giving alarm laugh vocalization on the breeding grounds. Chukotka, Russia. May.

Sean Crane / Black-tailed Prairie Dog (Cynomys ludovicianus) sounding alarm call, Badlands National Park, South Dakota

Kevin Schafer / Black-tailed Prairie Dog (Cynomys ludovicianus) giving alarm call at burrow entrance, Devils Tower National Monument, Wyoming

Nick Garbutt / Female Capybara (Hydrochoerus hydrochaeris) swimming with young and alarm calling after escaping a Jaguar attack (Panthera onca palustris) in a lagoon off the Paraguay River, Taiama Ecological Reserve...

Will Burrard-Lucas / Blick's grass rat (Arvicanthis blicki) making alarm call, Bale Mountains National Park, Ethiopia.

Will Burrard-Lucas / Blick's grass rat (Arvicanthis blicki) making alarm call, Bale Mountains National Park, Ethiopia.

Denis-Huot / Dwarf mongoose (Helogale parvula) calling in alarm, Masai-Mara Game Reserve, Kenya

Andy Trowbridge / Variable Oystercatcher (Haematopus unicolor) giving alarm call, endemic to New Zealand. Sandfly Bay, Otago Peninsula, Otago, South Island, New Zealand, February.

Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit taking refuge in tree in caledonian forest after alarm call from adult female, The Black Isle, Highlands, Scotland, UK, July

Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit taking refuge in tree in caledonian forest after alarm call from adult female, The Black Isle, Highlands, Scotland, UK, July

Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit taking refuge in tree in caledonian forest after alarm call from adult female, The Black Isle, Highlands, Scotland, UK, July

Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit taking refuge in tree in caledonian forest after alarm call from adult female, The Black Isle, Highlands, Scotland, UK, July

Markus Varesvuo / Redshank (Tringa totanus) making alarm call, Norway, June

Gerrit Vyn / Surfbird (Aphriza virgata) in breeding plumage on its alpine breeding grounds. Bird is giving its alarm call. Seward Peninsula, Alaska, USA, June.

Gerrit Vyn / Adult male Black-bellied / Grey Plover (Pluvialis squatarola) giving an alarm call. Seward Peninsula, Alaska, USA, June.

Steve Knell / Redshank (Tringa totanus) giving alarm call to young from post. Outer Hebrides, Scotland, UK, May 2007

Dave Bevan / Great tit {Parus major} on branch sounding alarm call, Carmarthenshire, Wales, UK

John Cancalosi / Richardson's ground squirrel giving alarm call {Spermophilis richardsonii}

Kevin Schafer / Black-tailed Prairie Dog (Cynomys ludovicianus) giving alarm call at burrow entrance, Devils Tower National Monument, Wyoming

Cyril Ruoso / Barn Swallow (Hirundo rustica) hunting by night, boy imitates alarm call of the swallows and uses glue made with lemon juice and Llana sap, Nigeria

Cyril Ruoso / Barn Swallow (Hirundo rustica) hunting by night, boy imitates alarm call of the swallows and uses glue made with lemon juice and Llana sap, Nigeria

Bernard Castelein / Southern plains grey / Hanuman langur {Semnopithecus dussumieri} making alarm call, Sariska NP, Rajasthan, India

Roger Powell / Chukar (Alectoris chukar) male on guard and calling, farmland, K'Far Ruppin, Jordan Valley, Israel, March.

Warren Pereira / Bengal tiger (Panthera tigris tigris) female enters frame and walks alongside the edge of a lake with cubs while birds are alarm calling overhead, Ranthambhore, India, March.

Franco Banfi / Alpine marmot (Marmota marmota) standing upright, whistling an alarm call, Valcolla, Ticino, Switzerland. April.

Roland Seitre / Speke's Gazelle (Gazella spekei) showing inflated skin on top of muzzle which increases alarm call, native to Africa

Roland Seitre / Speke's Gazelle (Gazella spekei) showing inflated skin on top of muzzle which increases alarm call, native to Africa

Bruno D'Amicis / Vervet monkey (Chlorocebus pygerythrus) giving alarm call, sitting in tree in church forest. Church forests remain largely intact within a degraded landscape as they are considered sacred. Near Chimba...

Bruno D'Amicis / Vervet monkey (Chlorocebus pygerythrus) giving alarm call, sitting in tree in church forest. Church forests remain largely intact within a degraded landscape as they are considered sacred. Near Chimba...