Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) flying, threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man climbs "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009, Model released

David Noton / Panoramic view of Echo Lake, White Mountains, New Hampshire, New England, USA, North America

John Sparks / African elephant breeding herd (including Echo from Cynthia Moss EB family study group) Amboseli National Park, Kenya.

John Sparks / Elephants (including Echo & Ella of Cynthia Moss EB family study group) Amboseli NP, Kenya, East Africa

John Sparks / African elephant breeding herd. Amboseli National Park, Kenya. Cynthia Moss EB family study group the subject of Echo the Elephant.

Charlie Summers / Meteor going past comet 46P / Wirtanen and the Pleiades seen in early morning hours, Echo Lake, Colorado, USA. September 17 2018.

Charlie Summers / Widefield view of the comet 46P / Wirtanen buzzing past the Pleiades during the early morning hours. Echo Lake, Colorado, USA. September 17, 2018.

Jack Dykinga / 'Pot Holes' full of rain water, with reflections of clouds at sunset. Milkyway, Bears Ears National Monument, Echo Mesa, Utah. USA. November 2018.

Jack Dykinga / Eroded 'Pot Holes' full of rain water at night with the Milky-way and shooting star , Bears Ears National Monument, Echo Mesa, Utah. USA. November 2018.

Jack Dykinga / 'Pot Holes' full of rain water, with reflections of clouds. Milkyway, Bears Ears National Monument, Echo Mesa, Utah. USA. November 2018.

Jack Dykinga / 'Pot Holes' full of rain water, with reflections of clouds at sunset. Milkyway, Bears Ears National Monument, Echo Mesa, Utah. USA. November 2018.

Jack Dykinga / Balanced rock hoodoo in Echo Canyon silhouetted against the rising Milk Way. Chiricahua National Monument, Arizona, USA, April.

Jack Dykinga / Balanced rock hoodoo in Echo Canyon in sunset light, Chiricahua National Monument, Arizona, USA, April 2018.

Jack Dykinga / Balanced rock hoodoo in Echo Canyon in sunset light, Chiricahua National Monument, Arizona, USA, April 2018.

Jack Dykinga / Balanced rock hoodoo in Echo Canyon silhouetted against the rising Milk Way. Chiricahua National Monument, Arizona, USA. April.

Kirkendall-Spring / Snow covered trees at Echo Ridge above the town of Chelan. Washington, USA. January 2018.

Kirkendall-Spring / Winter sunrise at Echo Ridge above the town of Chelan. Washington, USA. January 2018.

Kirkendall-Spring / Winter sunrise at Echo Ridge above the town of Chelan. Washington, USA. January 2018.

Julian Hume / Illustration of Mare aux Songes, 4,000 years ago. All of the animals in this image, apart from the Echo Parakeet (Psittacula echo), Pink pigeon (Nesoenas mayeri) Mauritius kestrel (Falco punctatus) an...

Tim Fitzharris / Hoodoos from Massai Point Nature Trail, Echo Canyon, Chiricahua National Monument, Arizona

Tim Fitzharris / Hoodoos in the Grotto, Echo Canyon, Chiricahua National Monument, Arizona

Tim Fitzharris / Sandstone cliffs, Echo Amphitheatre, New Mexico

Tim Fitzharris / Miner's Candle (Cryptantha virgata) flowers, Echo Canyon, Vermilion Cliffs National Monument, Arizona

Tim Fitzharris / Boulders, Echo Canyon, Vermilion Cliffs National Monument, Arizona

Floris van Breugel / Red Fox kit (Vulpes vulpes) hunting at night in Echo Canyon, Death Valley National Park, California, USA. January.

Floris van Breugel / Creosote bush (Larrea tridentata) with Echo Canyon below, under the golden light of sunset, Death Valley National Park, California, USA, November 2013.

Kirkendall-Spring / Echo Lake in the Seven Devils Mountains - part of the Seven Devils - Hells Canyon Wilderness area, Idaho, USA, September 2011

Oriol Alamany / Hikers walking past a beech (Fagus sylvatica) in Echo Valley, Los Valles Occidentales,Natural Park, Pyrenees, Huesca, Aragon, Spain

Rick Tomlinson / Club Swan 42 "Long Echo" during Antigua Race Week 2008. Day 1, halfway round the Island Race, Falmouth to Dickenson Bay anti clockwise.

Ernie Janes / Echo Crater, Waimangu, North Island, New Zealand, 2009

Ernie Janes / Echo Crater after 1886 eruption, Waimangu, North Island, New Zealand

Jerry Monkman / Echo Lake as seen from Beech Cliff, Acadia National Park, Maine, USA, August 2009

Mark Carwardine / Mauritius / Mascarene / Echo parakeets (Psittacula eques) in habitat, threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) threatened / endangered species, Black River Gorges, Mauritius, Indian Ocean, wild

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) feeding in cage at feeding bowls, Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Mark Carwardine / Mauritius / Mascarene / Echo parakeet (Psittacula eques) Threatened / endangered species, Mauritian Wildlife Foundation breeding centre, Mauritius, captive

Jerry Monkman / View of Moat Mountain from Cathedral Ledge in Echo Lake State Park, White Mountains, North Conway, New Hampshire, USA. October 2009

Jerry Monkman / View of White Horse Ledge, Cathedral Ledge, and Echo Lake, Echo Lake State Park, White Mountains, North Conway, New Hampshire, USA. October 2009

Jerry Monkman / A woman leads a climb of "Top of the Prow" rock on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009

Jerry Monkman / A woman leads a climb of "Top of the Prow" on Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009

Jerry Monkman / A woman rappels from the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009

Jerry Monkman / A man rock climbing near the top of Cathedral Ledge. Echo Lake State Park, White Mountains, in North Conway, New Hampshire, USA. October 2009

Stephen Dalton / Greater false vampire bat (Megaderma lyra) flying in complete darkness between wire strands, demonstrating echo location, Research at Frankfurt University, Germany, controlled conditions

Stephen Dalton / Mexican Bulldog / Fishing bat (Noctilio leporinus) This large bat catches fish with its feet in a similar fashion to the osprey, except it uses echo location to detect the water ripples produced by t...

Mark Taylor / Ginger kitten hiding under the legs of a German Shepherd Dog (Alsatian) bitch puppy, Echo.

Mark Taylor / German Shepherd Dog (Alsatian) bitch puppy, Echo, with a tabby kitten.

Mark Taylor / Ginger kitten with German Shepherd Dog (alsatian) bitch puppy, Echo.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, with grey windmill-eared rabbit.

Mark Taylor / German Shepherd Dog (Alsatian) bitch puppy, Echo, lying with head raised

Mark Taylor / German Shepherd Dog (Alsatian) bitch puppy, Echo, lying with head raised.

Mark Taylor / German Shepherd Dog bitch puppy, Echo.

Mark Taylor / German Shepherd Dog bitch pup, Echo, lying with head up.

Mark Taylor / German Shepherd Dog (Alsatian) bitch puppy, Echo, with Lionhead rabbit.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, rolling playfully.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, with Lionhead rabbit.

Mark Taylor / German Shepherd Dog (Alsatian) bitch puppy, Echo, with grey windmill-eared rabbit.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, with a tabby kitten.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, looking up

Mark Taylor / Tabby kitten getting cross with a German Shepherd Dog bitch puppy, Echo.

Mark Taylor / German Shepherd Dog bitch puppy, Echo, with grey windmill-eared rabbit.

Shattil & Rozinski / Mooonwort {Botrychium echo} USA

Shattil & Rozinski / Mooonwort {Botrychium echo} leaf USA

Mark Taylor / German Shepherd Dog bitch puppy, Echo, wearing a Father Christmas hat.

Shattil & Rozinski / Moonwort {Botrychium echo} showing sporangia on fertile leaf, Colorado, USA

Jack Dykinga / Rock spires in last rays of sunset, Echo Canyon, Chiricahua National Monument, Arizona, USA

Todd Pusser / Atlantic spotted dolphin using echo-location to find fish in sand, Atlantic.

Cynthia Moss / Camerman Martyn Colbeck and elephant calf Ebony, daughter of Echo, on location for BBC programme Echo the Elephant, 1995

Julian Hume / Illustration of Mauritius dawn showing extinct species. A Mauritius giant tortoise (Cylindraspis inepta) - extinct c 1730 - awaits the warmth of the morning sun,while the Thirioux's grey parrot (Psitt...

Julian Hume / Illustration of Broad billed parrot / Raven parrot (Lophopsittacus mauritianus) - extinct 1674 - male right,female left,with echo parakeet (Psittacula echo),the only surviving Mascarene parrot (critic...

MARTYN COLBECK / Martyn Colbeck on location in Amboseli NP, Kenya, filming from Landrover for BBC television programme "Echo of the Elephants: The next Generation" filmed 1992-1995, Kenya

MARTYN COLBECK / Martyn Colbeck on location in Amboseli NP, filming Elephants for BBC television programme "Echo of the Elephants: The next Generation" filmed 1992-1995, Kenya

MARTYN COLBECK / Martyn Colbeck on location at Amboseli Elephant Research Camp, Kenya, with elephants in the background. On location for BBC television programme "Echo of the Elephants: The next Generation" filmed 199...

Nick Garbutt / Mauritius parakeet in aviary {Psittacula echo} Mauritius

Roland Seitre / Mauritius parakeet (Psittacula eques) juvenile, feeding in tree, Ebony forest Chamarel, Mauritius. Endangered.

Roland Seitre / Mauritius parakeet (Psittacula eques) female, perched in tree, Black River Gorges National Park, Mauritius.

Roland Seitre / Mauritius parakeet (Psittacula eques) female, perched in tree, Black River Gorges National Park, Mauritius.

Roland Seitre / Mauritius parakeet (Psittacula eques) male, perched in tree, Black River Gorges National Park, Mauritius.

Roland Seitre / Mauritius parakeet (Psittacula eques) male, perched in tree, Black River Gorges National Park, Mauritius.

Tim Laman / Photographer Tim Laman with daughter, Jessica Laman and son, Russell Laman, filming team for Loon project at work on the shores of Echo Lake, Mount Desert Island. Maine, USA.

Bruce Thomson / Lesser fishing bat (Noctilio albiventris) echo-locating from roost, Pocone, Brazil.

Philip Stephen / Supply vessel ' Rem Mistral' offloading cargo at 'Forties Echo', North Sea. August 2020.

David Hall / Painted greenling (Oxylebius pictus) Cramer Pass, Echo Bay, Gilford Island, British Columbia, Canada. March.

Shane Gross / Bottlenose dolphin (Tursiops truncatus) use echo-location to find prey hiding just under the sand, Eleuthera, Bahamas.

Shane Gross / Bottlenose dolphins (Tursiops truncatus) use echo-location to find prey hiding just under the sand, Eleuthera, Bahamas.

Barry Mansell / Echo Moth (Seirarctia echo) USA.