Fergus Gill / Greylag goose (Anser anser) calling at dawn with its breath showing as a cloud of steam. Serrated tomia (the equivalent of teeth) are visible in its beak. Scotland, Dec .

SCOTLAND: The Big Picture / Mysid on algae (Fucus serratus), Shetland Isles, Scotland, UK, June.

Nick Upton / Seaweeds including Thongweed / Sea thong (Himanthalia elongata), Tangleweed kelp (Laminaria digitata), Toothed wrack (Fucus serratus) and Dulse (Palmaria palmata). Exposed on rocky shore on low spring...

Ashley Cooper / Mont Blanc above Chamonix, French Alps, France. September 2014.

Ashley Cooper / Aiguille Verte and Les Drus in the Mont blanc range above Chamonix, French Alps, France, September 2014.

Ashley Cooper / Solar panels on the Cabanne D' Orny in the Swiss Alps, providing electricity for this off grid mountain hut at over 10,000 feet. Switzerland, August 2014

Ashley Cooper / Solar panels on the Cabanne D' Orny in the Swiss Alps, providing electricity for this off grid mountain hut at over 10,000 feet. Switzerland, August 2014

Ashley Cooper / The Aiguillette des Posettes with Bilberry plants colouring up in late summer, above Chamonix, French Alps, and the rapidly retreating Glacier du tour. France, September 2014.

Ashley Cooper / The Aiguillette des Posettes with Bilberry plants colouring up in late summer, above Chamonix, French Alps, and the rapidly retreating Glacier du tour. September 2014.

Ashley Cooper / The rapidly retreating glaciers of Glacier De La Lex Blanche and Glacier du Petit Mont Blanc on the Aiguille De Tre La Tete in the Italian Alps on the Tour Du Mont Blanc.

Ashley Cooper / The rapidly retreating glaciers of Glacier De La Lex Blanche and Glacier du Petit Mont Blanc, Aiguille De Tre La Tete, Alps, Italy, Augsut 2014.

Ashley Cooper / Rapidly retreating glaciers of Glacier De La Lex Blanche and Glacier du Petit Mont Blanc on the Aiguille De Tre La Tete, Alps, Italy, August 2014.

Ashley Cooper / Rapidly retreating Brouillard glacier, and Freney Glacier, on the slopes of Mont Blanc du Courmayeur, the newly exposed rock clearly reveals the area the glacier used to cover. IAlps, Italy, August.

Ashley Cooper / Rapidly retreating glaciers of Glacier De La Lex Blanche and Glacier du Petit Mont Blanc, Aiguille De Tre La Tete, Italian Alps, Italy, August 2014.

Juergen & Christine Sohns / Hippopotamus (Hippopotamus amphibius) with East African Serrated Mud Turtles (Pelusios sinuatus) on back, Sabi-sands Game Reserve, South Africa

Alex Mustard / Grey seal (Haichaoerus grypus) large female adult sleeps in a bed of seaweeds (Fucus serratus) Lundy Island, Devon, England, UK Bristol Channel, August.

Alex Mustard / Grey seal (Haichaoerus grypus) young female opens her mouth playfully while she looks up from a bed of shallow seaweeds (Fucus serratus) Lundy Island, Devon, UK. Bristol Channel, August

Alex Mustard / Grey seal (Halichoerus grypus) young seal opens its moutfh towards the camera, while swimming over a shallow bed of seaweeds (Fucus serratus) Lundy Island, Devon, UK. Bristol Channel. North East Altan...

Alex Mustard / Grey seal (Halichoerus grypus) large female exhales a stream of bubbles as she sleeps on shallow seaweeds (Fucus serratus) Lundy Island, Devon, UK, Bristol Channel, August. Highly commended in the Hab...

Daniel Heuclin / Serrated casquehead iguana (Laemanctus serratus) with open mouth, captive, occurs in central America.

Daniel Heuclin / Serrated casquehead iguana (Laemanctus serratus) with open mouth, captive, occurs in central America.

Cyril Ruoso / Forest hingeback tortoise (Kinixys erosa) in shallow woodland pool, Lobeke / Lake Lobak National Park, Cameroon, July.

Tony Wu / Segment of an Architeuthis giant squid feeding tentacle (tentacular arm) that was left in the water by a sperm whale (Physeter macrocephalus) after it breached. This squid arm fragment measured 351 ce...

Solvin Zankl / Intertidal rocks covered in seaweeds, including brown algae: Toothed wrack (Fucus serratus), and Thongweed (Himanthalia elongata), red algae: left Chylocladia verticillata, middle Pepper Dulse (Osmu...

Solvin Zankl / Tide pool with Brown algaes - Toothed wrack (Fucus serratus) and Japanese wireweed (Sargassum muticum) and Red algae (Calliblepharis jubata) Roscoff, France

Solvin Zankl / Intertidal rocks covered in seaweeds, including, brown algae: at top Toothed wrack (Fucus serratus) and on the left Bifurcaria bifurcata. Red algae: middle and bottom right Pepper dulse (Osmundea pinn...

Alex Hyde / Tube Worms (Spirorbis spirorbis) on Toothed Wrack (Fucus serratus), photographed on a white background in mobile field studio. Isle of Skye, Inner Hebrides, Scotland, UK. April.

Alex Hyde / Tube Worms (Spirorbis spirorbis) on Toothed Wrack (Fucus serratus). Isle of Skye, Inner Hebrides, Scotland, UK

Nick Upton / Toothed wrack (Fucus serratus) on rocks exposed at low tide and submerged in a rockpool, Lyme Regis, Dorset, UK, May.

Danny Green / 2020VISION / Atlantic puffin (Fratercula arctica) stretching its wings on a cliff top, Sule Skerry, Scotland, UK, July. 2020VISION Book Plate. Did you know? Puffin beaks are evolved to carry many fish - with a ser...

Nick Upton / Toothed / Serrated wrack (Fucus serratus) submerged at mid tide, near Falmouth, Cornwall, UK, August.

Nick Upton / Split level view of Toothed / Serrated wrack (Fucus serratus) clumps at mid tide, near Falmouth, Cornwall, UK, August.

Adrian Davies / Serrated wrack (Fucus serratus) UK, July

Mike Read / Hooded merganser (Lophodytes cucullatus) male, Radipole Lake RSPB Reserve, Dorset March

Robert Thompson / Serrated wrack {Fucus serratus} exposed at low tide, Ballyhenry Point, Strangford Lough, County Down, Northern Ireland, UK, September

Claudio Contreras / Serrated casquehead iguana (Laemanctus serratus) head portrait, Puerto Morelos, Yucatan Peninsula, Mexico, January

Claudio Contreras / Serrated casquehead iguana (Laemanctus serratus) camouflaged amongst leaves, Puerto Morelos, Yucatan Peninsula, Mexico, January

Claudio Contreras / Serrated casquehead iguana (Laemanctus serratus) amongst leaves, Puerto Morelos, Yucatan Peninsula, Mexico, January

Stephen Dalton / Close up of three claws and serrated teeth of foot that help to grip and control the strands of the web of Garden Spider (Araneus diadematus) UK

Stephen Dalton / Close up of three claws and serrated teeth of foot that help to grip and control the strands of the web of Garden Spider (Araneus diadematus) UK

Kevin Schafer / Bromeliad (Navia tentacula) detail showing serrated leaves, Texas

PREMAPHOTOS / Serrated millipede (Lophostreptus sp.) coiled up defensively in savannah, Kenya

David Tipling / Toothed / Serrated wrack {Fucus serratus} exposed at low tide, Isles of Scilly, Cornwall, UK

Jason Smalley / Serrated wrack {Fucus serratus} and Kelp, probably Tangle oarweed {Laminaria digitata} Stackpole, Pembrokeshire, Wales, UK

WILLIAM OSBORN / Serrated turtle / terrapin {Pelusios sinuatus} Kruger NP, South Africa

Doug Perrine / Serrated teeth in lower jaw of Tiger shark {Galeocerdo cuvieri}

Doug Perrine / Serrated tooth of Tiger shark {Galeocerdo cuvieri}

Doug Perrine / Rows of serrated teeth in lower jaw of Tiger shark {Galeocerdo cuvieri}

DOC WHITE / Close up of tooth of Great white shark {Carcharodon carcharias}

Geoff Simpson / Serrated wrack seaweed {Fucus serratus} exposed at low tide, Gwynned, Wales, UK

Niall Benvie / Serrated (Toothed) wrack (Fucus serratus) with marine mollusc (Littorina littoralis) on the seaweed. Scotland, UK, Europe

GEORGETTE DOUWMA / Shortfin mako shark tooth {Isurus oxyrinchus}

GEORGETTE DOUWMA / Tiger shark teeth {Galeocerdo cuvieri}

Lewis Jefferies / Grey seal (Halichoerus grypus) amongst Serated wrack (Fucus serratus) and Thongweed (Himanthalia elongata) on seabed, Lundy Island, Bristol Channel, Devon, UK.

Linda Pitkin / Serrated spurge / Sawtooth spurge (Euphorbia serrata) in flower, Manacor, Mallorca, Balearic Islands. April.

Tui De Roy / Leatherback turtle (Dermochelys coriacea) newly emerged hatchling with sharply pointed 'egg tooth' and serrated jaw visible, head portrait, Grande Riviere, Trinidad Island, Trinidad & Tobago...

Alex Mustard / Serrated wrack (Fucus serratus) and Spaghetti seaweed (Himanthalia elongata) growing in abundance on seabed, Island of Coll, Inner Hebrides, Scotland, UK, Atlantic Ocean.

Alex Mustard / Seaweeds in shallow water, with thongweed (Himanthalia elongata) growing over serrated wrack (Fucus serratus). Falmouth, Cornwall, England, United Kingdom. British Isles. North East Atlantic Ocean.

Alex Mustard / Serrated wrack (Fucus serratus) reflected in the surface as it grows in a rockpool. Looe, Cornwall, England, United Kingdom. British Isles. English Channel, North East Atlantic.

Alex Mustard / Shallow water seaweeds (including sea lettuce: Ulva spp. and serrated wrack: Fucus serratus) carpet the seabed. Looe, Cornwall, England, United Kingdom. British Isles. English Channel, North East Atla...

Steven David Miller / Spiny-legged katydid (Paracaedicia serrata) camouflaged in the leaves of a tropical plant, Cairns Botanical Garden, Queensland, Australia. April.

Alex Mustard / Serrated wrack (Fucus serratus) reflected in the surface as it grows in a rockpool. Looe, Cornwall, England, United Kingdom. English Channel, North East Atlantic.

Alex Mustard / Seaweed including Bladder wrack (Fucus vesiculosus) egg wrack (Ascophyllum nodosum; serrated wrack (Fucus serratus) grows around the edge of a rockpool. Looe, Cornwall, England, United Kingdom. Englis...

Paul Harcourt Davies / Serrated wintergreen (Orthilia secunda). Near Campitello di Fassa, Dolomites, Trentino, Italy. June.

Paul Harcourt Davies / Nodding wintergreen (Orthilia secunda) growing amongst Moss. Campitello di Fassa, Dolomites, Trentino, Italy. June.

Nigel Cattlin / Flower whorl and leaves of white dead-nettle (Lamium album) showing anthers, shape and structure. Berkshire,England,UK,April

Philippe Clement / Toothed wrack / serrated wrack (Fucus serratus) seaweed of the north Atlantic Ocean, Normandy, France, June