Kim Taylor / Bachacs / Leafcutter ants {Atta cephalotes} carrying sections of Cocoa leaf bearing 'riders' thought to ward off parasitic flies which would otherwise lay their eggs on the pieces of leaf. Trinidad, W...

Huw Cordey / Mexican free-tailed bats (Tadarida brasiliensis) emerging from Bracken Cave, Texas. Over 15 million bats are thought to live in this cave, making it the greatest concentration of mammals on the planet...

Paul D Stewart / Photographic reconstruction of Archaeopteryx by Paul D. Stewart. The fossils of this species was from 150 million years ago, and is thought of as a stage between feathered dinosaurs and modern birds.

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Rear view of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Tail flippers of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Linda Pitkin / 2020VISION / Mute Swan (Cygnus olor) swimming in harbour, viewed from underwater, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, October 2011. Did you know? In Scotland and Ir...

Joe Cornish / 2020VISION / Pool and Stac Pollaidh, Coigach / Assynt SWT, Sutherland, Highlands, Scotland, UK, June 2011. Did you know? The peak of Stac Polliadh is very severely weathered and it is thought that during the last...

Ross Hoddinott / 2020VISION / European Beech tree {Fagus sylvatica} Yellow leaves in autumn, Sence Valley Forest Park, Leicestershire, UK. November. 2020VISION Book Plate. Did you know? Although thought to have been introduced by...

John Cancalosi / Blacktail Prairie Dog (Cynomys ludovicianus) engaging in Jump-yip behavior - A strong arch of the back or "jump" followed by a shrill "yip" - Thought to occur when a predator has left the area and in...

Stephen Dalton / Green mosaic / Rancho grande harlequin frog (Atelopus cruciger) walking along tree trunk, Henri Pittier NP, Venezuela, South America, Critically endangered, thought extinct until a gravid female was f...

Solvin Zankl / Murrays abyssal anglerfish (Melanocetus murrayi) Atlantic ocean. A deep-sea fish with bioluminescent lure used to attract prey. The bioluminescence is produced by symbiotic bacteria; these bacteria ar...

Doug Perrine / Humpback whale calf breaching {Megaptera novaeangliae} Hawaii, Pacific Ocean - taken under research permit #587. Breaching beahviour is thought to dislodge external skin parasites. (Non-ex).

Shane Gross / Scuba diver feeds an invasive lionfish (Pterois volitans) to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought that if the sharks learned that lionfish...

Shane Gross / Scuba diver feeds an invasive lionfish (Pterois volitans) to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought that if the sharks learned that lionfish...

Shane Gross / An invasive lionfish (Pterois volitans) is fed to a Caribbean reef shark (Carcharhinus perezi) off Grand Bahama Island, Bahamas. It was once thought sharks could be trianed to feed on lionfish by feed...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Nick Garbutt / Traditional Baining Fire Dance. Performed by men from the Baining tribe who enter a trance like state and dance around and through the fire in masks thought to resemble insects to contact the spirit w...

Karine Aigner / Biologist feeding Hermit thrush (Catharus guttatus) a mixture of elderberry powder. This powder is full of an antioxidant called anthocyanin. The anthocynanin is thought to help birds recover from and...

Ashley Cooper / The Broch of Gurness, the best preserved Broch in Orkney, on mainland island. This defensive building was thought to have been constructed between 100 and 200 BC.

Ashley Cooper / The Broch of Gurness, the best preserved Broch in Orkney, on mainland island. This defensive building was thought to have been constructed between 100 and 200 BC.

Ashley Cooper / The Broch of Borwick on the west coast of Mainland Orkney, Scotland, UK, thought to date from the first millenium BC and probably in use for over 1000 years.

Ashley Cooper / The Broch of Gurness, the best preserved Broch in Orkney, on mainland island. This defensive building was thought to have been constructed between 100 and 200 BC.

Ashley Cooper / The Broch of Gurness, the best preserved Broch in Orkney, on mainland island. This defensive building was thought to have been constructed between 100 and 200 BC. .

Eladio Fernandez / Humpback whale (Megaptera novaeanglae) turns on its back to 'fin slap' a behavior thought to request companionship from another whale. Hispaniola, Dominican Republic.

Daniel Heuclin / Jaguarundi (Puma yagouaroundi) female with two kittens, one red colour morph, captive, occur in the Americas from Arizona to Argentina. Red individuals of this species were once thought to be a separa...

Daniel Heuclin / Jaguarundi (Puma yagouaroundi) two kittens, one red colour morph, captive, occur in the Americas from Arizona to Argentina. Red individuals of this species were once thought to be a separate species c...

Daniel Heuclin / Jaguarundi (Puma yagouaroundi) female with her red colour morph kitten behind, captive, occur in the Americas from Arizona to Argentina. Red individuals of this species were once thought to be a sepa...

Steve O. Taylor (GHF) / Straw-coloured fruit bats (Eidolon helvum), thought to be the natural reservoir of the Ebola virus, for sale in Brazzaville market, Republic of the Congo, 2013.

Luke Massey / Garden spider (Araneus diadematus) makes its web within the Chernobyl Exlusion Zone. It is thought the spiders make deforemd webs due to the radiation. Ukraine. September

Mike Potts / Looking toward Dent Island, where the long thought extinct Campbell Island teal (Anas aucklandica) was rediscovered in 1975, Campbell Island, Subantarctic New Zealand, January

Mike Potts / Campbell Island teal (Anas aucklandica) a flightless species thought to be extinct until it was found on Dent Island, a rat free isolated islet off Campbell Island in 1975. Probably the worlds rarest...

Paul D Stewart / Lithograph of a slab with multiple dinosaur trackways. From 'Ichnology of New England. A Report on the Sandstone of the Connecticut Valley, especially its Fossil Footmarks'. Boston: William White, 185...

Paul D Stewart / Lithograph of a dinosaur track from 'Ichnology of New England. A Report on the Sandstone of the Connecticut Valley, especially its Fossil Footmarks'. Boston: William White, 1858. The prints were first...

Paul D Stewart / Woodblock illustration of Sea Hares from Ortus (Hortus) Sanitatis 1491 - translated from the Latin as 'Garden of Health'. During the middle ages all manner of land animals were thought to have their o...

Paul D Stewart / 1491 Woodblock illustration of from Ortus (Hortus) sanitatis - translated from the Latin as 'Garden of Health'. Shows an apothecary removing a toad stone bezoar from a large toad's 'third eye'. Toad s...

Paul D Stewart / Woodcut illustration of dolphin's placenta, skull and birth by Gesner. Gesner 'Icones Animalium', 1560. Generally animals were grouped by habitat, so dolphins were thought of as fish. However Gesner d...

Suzi Eszterhas / Cape Pangolin (Manis temminckii) being touched by safari guide, thought to bring good luck, northern Botswana

Franco Banfi / Mass stranding of Humboldt squid (Dosidicus gigas) on shore of Baja California, Mexico, East Pacific Ocean. These mass strandings are thought to be caused by 'red tides' or build ups of toxic algae.

Franco Banfi / Mass stranding of Humboldt squid (Dosidicus gigas) on shore of Baja California, Mexico, East Pacific Ocean. These mass strandings are thought to be caused by 'red tides' or build ups of toxic algae.

Christophe Courteau / Young Burchell's zebra (Equus quagga burchellii) sniffing dead pregnant female that died due to complications whilst giving birth, he is thought to be her foal from a previous year. Etosha National Pa...

Steve O. Taylor (GHF) / Local man sat by ancient rock engravings of human and animal figures, thought to be at least 8000 years old. Northern Niger, 2005.

Steve O. Taylor (GHF) / Ancient rock engravings of human and animal figures, thought to be at least 8000 years old. Northern Niger, 2005.

Steve O. Taylor (GHF) / Ancient rock engravings of elephants, thought to be at least 8000 years old. Northern Niger, 2005.

Steve O. Taylor (GHF) / Ancient rock engravings of human and animal figures, thought to be at least 8000 years old. Northern Niger, 2005.

Steve O. Taylor (GHF) / Local man sat by ancient rock engravings of human and animal figures, thought to be at least 8000 years old. Northern Niger, 2005.

Steve O. Taylor (GHF) / Ancient rock engravings of giraffes, thought to be at least 8000 years old. Northern Niger, 2005.

Mark MacEwen / Dry Falls, at five times the width of Niagara, Dry Falls is thought to be the greatest known waterfall that ever existed, left behind by the great ice age floods. Grant County, Washington, North Ameri...

Mark MacEwen / Dry Falls, at five times the width of Niagara, Dry Falls is thought to be the greatest known waterfall that ever existed, left behind by the great ice age floods. Grant County, Washington, North Ameri...

RHONDA KLEVANSKY / Politcial slogans nailed to a tree stating: "Culture is knowing the best that has been thought and said" and "Woman is revolution" near Baracoa, Cuba, November 2011.

Stephen Dalton / Star jelly / astromyxin a mysterious gelantinous substance of unknown origin, originally thought to have come from stars, Sussex, England, UK, March.

Simon Colmer / African Mahogany (Khaya anthotheca) close up of bark, Budongo Forest Reserve, Uganda. . This specimen is estimated to be over 400 years old and is thought to be one of the tallest remaining of its spe...

Simon Colmer / African Mahogany tree (Khaya anthotheca), Budongo Forest Reserve, Uganda. . This specimen is estimated to be over 400 years old and is thought to be one of the tallest remaining of its species in Ugan...

Simon Colmer / African Mahogany tree (Khaya anthotheca), Budongo Forest Reserve, Uganda. . This specimen is estimated to be over 400 years old and is thought to be one of the tallest remaining of its species in Ugan...

Chris Mattison / Aesculapian snake (Zamenis longissimus) close-up of dorsal scales from a shed skin, showing apical pits, thought to be sensory organs. Native to southern Europe.

Anup Shah / Sumatran orangutan (Pongo abelii) mature male 'Halik' aged 26 years sitting in a forest clearing. Gunung Leuser National Park, Sumatra, Indonesia. Rehabilitated and released (or descended from those w...

Floris van Breugel / Moonrise over the flooded Alvord Desert with photographer Floris van Breugel watching the sky. Long exposure. Harney County, Oregon. January 2010

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Callantha's Orchid (Ophrys oxyrrynchos ssp calliantha) a subspecies thought to have arisen from crosses between O. oxyrrynchos and O.candica, near Ferla, Sicily, May. Meetyourneighbours.net project

MYN / Paul Harcourt Davies / Late Ophrys (Ophrys tardans) an endemic species restricted to S. Puglia. Thought to have arisen from hybrisation between O. Candica and O. tenthredinifera. Taken near San Cataldo, Lecce, Puglia Italy,...

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Tail flippers of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Photographer holding on to rope underwater to view the Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barr...

Mark Carwardine / Tail flippers of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Tail flippers of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / New Caledonia crested / Guichenot's giant / Eyelash gecko (Rhacodactylus ciliatus) captive, from South Province, New Caledonia. Thought to be extinct but rediscovered in 1994

Mark Carwardine / New Caledonia crested / Guichenot's giant / Eyelash gecko (Rhacodactylus ciliatus) using tongue to wipe its eye clean, captive, from South Province, New Caledonia. Thought to be extinct but rediscover...

Mark Carwardine / New Caledonia crested / Guichenot's giant / Eyelash gecko (Rhacodactylus ciliatus) captive, from South Province, New Caledonia. Thought to be extinct but rediscovered in 1994

Andrew Parkinson / Bengal Tiger (Panthera tigris), large six year old adult male rearing up to scratch off and eat bark, thought to soothe an upset stomach. Endangered. Bandhavgarh National Park, India. Non-ex.

Andrew Parkinson / Bengal Tiger (Panthera tigris), large six year old adult male rearing up to scratch off and eat bark, thought to soothe an upset stomach. Endangered. Bandhavgarh National Park, India. Non-ex.

Alex Mustard / 2020VISION / Amphipod (Iphimedia obesa) on top of a colony of Deadman's fingers (Alcyonium digitatum) coral, Loch Carron, Ross and Cromarty, Scotland, UK, April. Did you know? Although coral reefs are thought of a...

Terry Whittaker / 2020VISION / Flock of Waxwings (Bombycilla garrulus) flying over a hedge with Cotoneaster (Cotoneaster integerrimus) berries, Whitstable, Kent, England, UK, January. Did you know? Waxwings are so called for the re...

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) back showing scratch marks, thought to be from interaction and competition with other dolphin. Tin Can Bay, Queensland, Australia, September.

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) back with scratch marks and dorsal fin. Scratches are thought to be from interaction or competition with other dolphin. Tin Can Bay, Queensland, Austral...

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) dorsal skin, showing scratch marks, thought to be from social interactions or competition with other dolphin. Tin Can Bay, Queensland, Australia, Septem...

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) dorsal skin, showing scratch marks, thought to be from social interactions or competition with other dolphin. Tin Can Bay, Queensland, Australia, Septem...

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) blow-hole and back. Scratch marks are thought to be from social interactions or competition with other dolphin. Tin Can Bay, Queensland, Australia, Sept...

Roland Seitre / Australian humpback dolphin (Sousa sahulensis) portrait. Scratch marks are thought to be from social interactions or competition with other dolphin. Tin Can Bay, Queensland, Australia, September.

Merryn Thomas / 'Teide's Eggs' volcanic ejecta on Mount Teide volcano, thought to have been formed by rolling off the lava front. Tenerife, Canary Islands, April 2011.

Roland Seitre / Desert Warthog (Phacochoerus aethiopicus delamerei), a sub-species of warthog thought extinct until rediscovery in the late 20th century, with zebra and woman walking by. Tsavo National Park, Kenya, J...

Roland Seitre / Desert Warthog (Phacochoerus aethiopicus delamerei), a sub-species of warthog thought extinct until rediscovery in the late 20th century, in water. Tsavo National Park, Kenya, January 2009.