Chris Mattison / Green tree monitor (Varanus prasinus) with tongue out, captive from SE Asia.

Alex Mustard,Alex Mustard / A blue light fluorescence photo of Jewel anemones (Corynactis viridis). The blue light source excites the fluorescent pigments in the anemones, which emit light of other colours. The muddy seabed and...

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