Alex Mustard / Flamingo tongue (Cyphoma gibbosum) feeding on a seafan (Gorgonia ventalina) Cyphomas feed on corals and concentrate the toxic chemicals into their mantle, which they then wrap around the outside of it...

Roger Powell / Kingfisher (Alcedo atthis) territorial display to warn rivals. Castro Verde, Alentejo, Portugal, April.

Roger Powell / Kingfishers (Alcedo atthis) engaged in threat display to warn tresspassing rival. Castro Verde, Alentejo, Portugal, April.

Andrew Parkinson / Breeding pair of Great skuas (Stercorarius skua) in a territorial display to warn off approaching Skuas, Shetland Islands, Scotland, UK, June. (non-ex)

Alex Hyde / Shieldbug / Italian Striped-Bug / Minstrel Bug (Graphosoma lineatum) showing bold black and orange warning colours (aposematism) that warn of its foul taste. Photographed on a white background. Aosta...

Christophe Courteau / Young Walia ibex {Capra walie} and Gelada Baboons {Theropithecus gelada} Baboons alarm easily and warn Ibex of any danger, Simien NP, Ethiopia

Christophe Courteau / Young Walia ibex {Capra walie} and Gelada Baboons {Theropithecus gelada} Baboons alarm easily and warn Ibex of any danger, Simien NP, Ethiopia

Alex Mustard / Tropical blue ring octopus (Hapalochlaena lunulata) is small but has one of the most venomous creatures in the ocean, its bite injects a neurotoxin that paralyses its victim. It flashes its blue rings...

Anup Shah / Lioness (Panthera leo) trying to warn off herd of Cape buffalo (Syncerus caffer caffer), Masai Mara National Reserve, Kenya

Fiona Rogers / Bonobo (Pan paniscus) female carrying a baby acting agressively to warn off another, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.

Piper Mackay / Northern elephant seal (Mirounga angustirostris) vocalisaing to protect her pup, and warn off approaching female, Pt Piedras Blancas, California, USA

David Tipling / Mute swan (Cygnus olor) nesting on roadside verge with a bus driving past, sign n a cone to warn motorists to slow down, Cley, Norfolk, UK, May 2009

Merryn Thomas / Ruins of Signal tower (to warn of Napoleonic invasion) on the deserted island of Great Blasket. Blasket Islands, off the Dingle Peninsula, County Kerry, Republic of Ireland, May 2009.

Piotr Naskrecki / Blister Beetle (Mylabris sp) with aposematic coloration to warn predators of its toxins, Goegap Nature Reserve, Northern Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about their toxins, Kwazulu Natal, South Africa

Matthew Maran / Mist over temperate rainforest with Western red cedar (Thuja plicata) and Western Hemlock (Tsuga mertensiana) trees in Warn Bay. Vancouver Island, Canada

Matthew Maran / Western red cedar (Thuja plicata) tree in Warn Bay. These trees can stand dead for hundreds of years thanks to their high resistance to rot. Clayoquot Sound, Vancouver Island, Canada

George Chan / Male Tibetan antelope / Chiru (Pantholops hodgsonii) guarding his female harem in the Chang Tang Nature Reserve of central Tibet, bellowing load calls to warn off other males. December 2006,

Piotr Naskrecki / Milkweed Grasshopper (Phymateus morbillosus) with aposematic coloration to warn predators of its toxins, Cederberg, Western Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about toxins, Karoo National Park, Western Cape, South Africa

Piotr Naskrecki / Koppie Foam Grasshopper (Dictyophorus spumans) with aposematic coloration to warn predators about toxins, Karoo National Park, Western Cape, South Africa

Fred Bavendam / Common Lionfish (Pterois volitans) has bold stripes to warn predators of its venomous spines, Milne Bay, Papua New Guinea