David Pike / Moulton Barn, Antelope Flats, near Jackson, Wyoming, USA. Grand Teton NP. July 2009.

Christophe Courteau / African Paradise Flycatcher (Terpsiphone viridis) male sitting on nest on small branches in the shade. Okavango Delta, Botswana

Andy Sands / Green Woodpecker (Picus viridis) male looking alert among fallen apples in snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male among wind-fallen apples. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male foraging on wind-fallen apples, calling in aggression display to deter other birds. Hertfordshire, England, UK, February.

Alex Mustard / 2020VISION / Leach's spider crab (Inachus phalangium) sheltering from the current beneath tentacles of Snakelocks anemone (Anemonia viridis) Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Group of Jewel anemones (Corynactis viridis) photographed under blue light to show their fluorescence, Plymouth Sound, Devon, UK, July

Juergen Freund / Shoal of Blue chromis (Chromis viridis) amongst hard coral with Cloudy Damselfish (Dascyllus carneus) Sipadan, Malaysia.

Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.

Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.

Michel Poinsignon / Green woodpecker {Picus viridis} male at nest hole, Lorraine, France

Wild Wonders of Europe / Maitlan / European green toad (Bufo viridis) head portrait, Stenje region, Galicica National Park, Macedonia, June 2009. WWE INDOOR EXHIBITION

Wild Wonders of Europe / Wothe / Male European green lizard (Lacerta viridis) Eastern Slovakia, Europe, June 2009

Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / Male European green toad (Bufo viridis) in pond (at 2,711m) in Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) calling, vocal sac inflated, with eyes closed, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / European green toad (Bufo viridis) portrait, in a pond (at 2,711m) Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008

Wild Wonders of Europe / Schandy / Male European green toad (Bufo viridis) in pond (at 2,711m) in Adylsu valley, side valley to Baksan valley and Elbrus, Caucasus, Russia, June 2008

Wild Wonders of Europe / Nill / European Green Lizard (Lacerta viridis) Bulgaria, May 2008. WWE INDOOR EXHIBITION

Jose B. Ruiz / Green woodpecker (Picus viridis) drinking, Alicante, Spain

Jose B. Ruiz / Green woodpecker (Picus viridis) drinking, Alicante, Spain

Rolf Nussbaumer / Green Toad {Bufo viridis} National Park Lake Neusiedl, Austria, April

David Welling / Green tree python (Chondopython viridis) coiled on tree, captive

Kim Taylor / Green Hydra (Hydra viridis) walking. Digital Composite showing five movement stages. UK

Kim Taylor / Green Woodpecker (Picus viridis) male flying through Beech woodland in spring, Surrey, UK. Digital composite

Kim Taylor / Green Woodpecker (Picus viridis) using its tongue to extract a beetle larva from hole in Birch trunk. Digital composite, Surrey, UK

Michael D. Kern / Green tree python snake {Morelia / Chondopython viridis} portrait, captive, occurs Papua New Guinea and Indonesia

Michael D. Kern / Western green mamba snakes {Dendroaspis viridis} captive, Eastern Africa

Luiz Claudio Marigo / Dark winged trumpeter {Psophia viridis} River Negro, Amazonas, Brazil

Mike Wilkes / Green Woodpeckers feeding young at nest in tree, UK

Jim Brandenburg / Western Rattlesnake (Crotalus viridis) in defensive posture, South Dakota

Jim Brandenburg / Western Rattlesnake (Crotalus viridis) in defensive posture, South Dakota

WILLIAM OSBORN / Green woodpecker (Picus viridis) at nest hole. UK, England

Fabio Liverani / Green toad pair in amplexus, note eggs. Italy

Mike Wilkes / Green Woodpecker feeding young at nest in tree, England, UK

Mike Wilkes / Green Woodpecker feeding young at nest in tree, England, UK

Sue Daly / British underwater scenic with Jewel Anemones (Corynactis viridis) and Cuckoo Wrasse (Labrus bimaculatus). L'Etac, Sark, British Channel Islands, August.

Sue Daly / Jewel Anemones (Corynactis viridis) and Tompot Blenny (Parablennius gattorugine). Vingt Clos, Sark, British Channel Islands, August.

Sue Daly / British underwater scenic with Jewel Anemones (Corynactis viridis) and Cuckoo Wrasse (Labrus mixtus). Vingt Clos, Sark, British Channel Islands, August.

Sue Daly / Jewel Anemones (Corynactis viridis) colony. Les Dents, Sark, British Channel Islands, July.

Sue Daly / Jewel Anemones (Corynactis viridis) colonies of different colours. Vingt Clos, Sark, British Channel Islands, August., August.

Sue Daly / Snakelocks Anemone (Anemonia viridis). Maseline Harbour, Sark, British Channel Islands, July.

Sue Daly / Jewel Anemones (Corynactis viridis). Pavlaison, Sark, British Channel Islands, July.

Sue Daly / Jewel Anemones (Corynactis viridis). Pavlaison, Sark, British Channel Islands, July.

Sue Daly / Jewel Anemones (Corynactis viridis). Pavlaison, Sark, British Channel Islands, July.

Hermann Brehm / Green Woodpecker (Picus viridis) female on tree trunk, Germany

Hermann Brehm / Green Woodpecker (Picus viridis) female on tree trunk and with Red Squirrel (Red squirrel) emerging from hole in the tree, Germany, April

Hermann Brehm / Green Woodpecker (Picus viridis) juvenile, Germany

Wild Wonders of Europe / Muñoz / Willow emerald damselfly (Lestes viridis) at rest, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanca, Castilla y Leon, Spain

Wild Wonders of Europe / Muñoz / Willow emerald damselfly (Lestes viridis) at rest, Campanarios de Azaba Biological Reserve, a rewilding Europe Area, Salamanca, Castilla y Leon, Spain

Mark Carwardine / Green tree python (Chondopython / Morelia viridis) captive, from rainforests of New Guinea and extreme northern Queensland

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python portrait {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Juvenile Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Mark Carwardine / Green tree python {Chondopython viridis} captive

Steven David Miller / Australasian or Yellow Figbird (Sphecotheres vieilloti) Port Douglas, Queensland, Australia, captive (wild bird in rehab centre)

Loic Poidevin / Green woodpecker (Picus viridis) parent feeding chicks at nest in tree, West France, June

Colin Varndell / Green sawfly (Rhogogaster virdis) resting on Nettle (Utrica) leaf, Dorset, England, UK, June

Thomas Marent / Green Bright-eyed Frog (Boophis viridis), Andasibe-Mantadia National Park, Madagascar

Nick Upton / Snakelocks anemone (Anemonia viridis) among Coralweed (Corallina officinalis) ejecting remains of its prey, a mussel shell. Rhossili, The Gower Peninsula, July.

Nick Upton / Snakelocks anemone (Anemonia viridis) attached to a boulder alongside Coralweed (Corallina officinalis) and Flat / Purple top shells (Gibbula umbilicalis) in a rockpool, Rhossili, The Gower Peninsula,...

Nick Upton / Snakelocks anemone (Anemonia viridis) filter feeding in a rockpool, with closed Beadlet anemone (Actinia equina) in the background. Rhossili, The Gower Peninsula, July.

Georgette Douwma / Blue green chromis (Chromis viridis) shoal over coral reef, Maldives, Indian Ocean

Nick Upton / Wide angle view of Green-leaf worm (Eulalia viridis) emerging from its retreat under Pepper dulse (Osmundea pinnatifida) a red algae to scavenge on rocks encrusted with Common / Northern rock barnacle...

Nick Upton / Wide angle view of Green-leaf worm (Eulalia viridis) emerging from its retreat under Pepper dulse (Osmundea pinnatifida) a red algae to scavenge on rocks encrusted with Common / Northern rock barnacle...

Nick Upton / Wide angle view of Green-leaf worm (Eulalia viridis) emerging from its retreat under Pepper dulse (Osmundea pinnatifida) a red algae to scavenge on rocks encrusted with Common / Northern rock barnacle...

Nick Upton / Wide angle view of Green-leaf worm (Eulalia viridis) emerging from its retreat under Pepper dulse (Osmundea pinnatifida) a red algae to scavenge on rocks encrusted with Common / Northern rock barnacle...

Sue Daly / Jewel sea anemones (Corynactis viridis) Channel Islands, UK May

Luiz Claudio Marigo / Amazonian white tailed / Green backed trogon (Trogon viridis) female perched in Tableland Atlantic Rainforest, Vale Natural Reserve, municipality of Linhares, Espa­rito Santo State, Eastern Brazil.

Sebastian Kennerknecht / African Paradise-Flycatcher (Terpsiphone viridis) female, Hawf Protected Area, Yemen

Martin Willis / Green Tree Python (Morelia viridis) coiled around tree branch, Iron Range, Cape York Peninsular, Australia

Martin Willis / Green Figbird (Sphecotheres viridis) female with palm fruit, Townsville, Queensland, Australia

Konrad Wothe / Green Figbird (Sphecotheres viridis) male, Daintree National Park, North Queensland, Australia

Andy Sands / Green Woodpecker (Picus viridis) male on snow, calling. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female looking for apples in snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male on snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female feeding on apple she has uncovered from snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female feeding on fallen apple on snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male perched on trunk of an apple tree. Hertfordshire, England, UK, October.

Andy Sands / Green Woodpecker (Picus viridis) male in alert posture among apples on ground. Hertfordshire, England, UK, October.

Andy Sands / Green Woodpecker (Picus viridis) male in snow with apple. The ants on his beak are from a previous attack on an ant nest. Hertfordshire, England, UK. February.

Andy Sands / Green Woodpecker (Picus viridis) female foraging for fallen apples in snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female preening on apple tree trunk. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female preening on apple tree trunk. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female foraging for fallen apples in snow. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male among wind-fallen apples. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) female preening on apple tree trunk. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male feeding on wind-fallen apples. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) male in alert posture among fallen apples. Hertfordshire, England, UK, December.

Andy Sands / Green Woodpecker (Picus viridis) male among wind-fallen apples. Hertfordshire, England, UK, February.

Andy Sands / Green Woodpecker (Picus viridis) perched on apple tree. Hertfordshire, England, UK, October.

Andy Sands / Green Woodpecker (Picus viridis) female ruffling her wet feathers on apple tree trunk. Hertfordshire, England, UK, November.