Piotr Naskrecki / Scorpion (Opisthacanthus asper), seen in UV light, Gorongosa National Park, Mozambique

Paul Bertner / Scorpion, seen under UV light, Bilsa Biological Reserve, Ecuador

Juergen Freund / Timelapse of a Scolymia coral (Mussidae) feeding, lit with a UV light, Cairns, North Queensland, Australia.

Paul Bertner / Thick-tailed Scorpion (Tityus sp), under UV light, Sani Lodge, Ecuador

Floris van Breugel / Various fluorescent minerals : 1Willemite, New Jersey, 2: Willemite and Calcite, New Jersey, 3: Fluorite, Ohio, 4: Willemite and Calcite, New Jersey. 5: Fluorite, California. 6: Scheelite, California....

Piotr Naskrecki / Scorpion (Brotheas sp) in defensive posture seen under ultraviolet light, Suriname

Piotr Naskrecki / Thick-tailed Scorpion (Tityus sp) under ultraviolet light, Suriname

Piotr Naskrecki / Scorpion young on the back of their mother, their soft cuticle is not yet reflecting ultraviolet light, Brownsberg Nature Park, Surinam

Ingo Arndt / Emperor Scorpion (Pandinus imperator) photographed under ultraviolet light, Africa

Albert Lleal / Giant Desert Hairy Scorpion (Hadrurus arizonensis) photographed under ultraviolet light showing fluoresence, native to southern North America and northern Mexico

Adrian Davies / Woman with sunscreen applied to one side of face, portrait under UV light. 2016. Model released.

Adrian Davies / Moths (Lepidoptera) attracted to UV night left on overnight. Costa Rica.

Heather Angel / Flowering rush (Butomus umbellatus), drops of nectar fluorescing in UV light. Surrey, England, UK. Focus stacked.

Heather Angel / Voodoo lily (Amorphophallus bulbifer), female flowers fluroescing in UV light, male flowers above. Native to Yunnan, China.

Heather Angel / Love-in-a-mist (Nigella damascena) stamens fluroescing in UV light. Ring of nectaries are dark red with blue UV reflective hairs.

Heather Angel / Arabian star flower (Ornithogalum arabicum) in UV light with exposed nectar fluorescing yellow. Native to Northern Africa and Southern Europe. Series 1/2.

Heather Angel / Flannel bush (Fremontodendron 'California Glory') exposed and overflowing nectaries fluorescuing in UV light. Native to southwest USA.

Heather Angel / Christmas rose (Helleborus niger) flower, pollen on dehisced anthers and on petals fluorescing in UV light. Nectar ring appearing red. Focus stacked.

Heather Angel / Goat willow (Salix caprea) female catkin in UV light, fine hairs and nectar fluroescing. Surrey, England, UK. Focus stacked.

Heather Angel / Darwin's slipper flower (Calceolaria uniflora) in UV light. Stamens and fleshy lip that provides food reward for polliator Least seedsnipe (Thinocorus rumicivorus) fluorescing. Native to Tierra de...

Heather Angel / Geraldton wax flower (Chamelaucium uncinatum), nectar fluorescing in UV light. Western Australia. Controlled conditions, focus stacked. Series 1/2.

Heather Angel / Large-flowered evening primrose (Oenothera glazioviana). Bull's eye in centre of flower fluorescing in UV light guides pollinators to nectaries. At night in garden. Surrey, England, UK.

Heather Angel / Foxglove (Digitalis purpurea), blue nectar guides and anthers, pollen and stigma fluorescing in UV light. Focus stacked.

Heather Angel / Seville orange (Citrus aurantium) flower fluorescing in UV light, colour attractive to pollinators. Cultivated in glasshouse, Surrey, England, UK. Focus stacked. Sequence 2/2.

Heather Angel / Winter aconite (Eranthis hymenalis) in UV light, pollen on outer stamens that have dehisced fluorescing. Focus stacked.

Heather Angel / Tulip tree (Liriodendron tulipifera) flower, pollen and nectar fluorescing in UV light. Surrey, England, UK. Native to USA. Focus stacked. Sequence 2/2.

Heather Angel / Two-coloured pineapple lily (Eucomis bicolor), nectar reservoirs fluorescing in UV light. Cultivated in garden, Surrey, England, UK. Native to South Africa. Focus stacked. Sequence 2/2.

Heather Angel / Porcelain orchid (Chloraea magellanica) with osmophores on lip fluorescing in UV light. Chile. Controlled conditions, focus stacked. Sequence 2/2.

Alex Hyde / Harvestman (Opiliones) fluorescing under ultraviolet light at night. Cloud forest, Manu Biosphere Reserve, Peru. November.

Piotr Naskrecki / Scorpion (Opisthacanthus asper), seen in UV light, Gorongosa National Park, Mozambique, 2 of 2

Piotr Naskrecki / Flat Rock Scorpion (Hadogenes granulatus), seen under UV light, Gorongosa National Park, Mozambique

Piotr Naskrecki / Horseshoe Crab (Limulus polyphemus) gathering on beach to lay eggs, seen under UV light, Delaware National Estuarine Research Reserve, Delaware

Paul Bertner / Stick insect, seen under UV light, Kinabalu National Park, Sabah, Borneo, Malaysia

Paul Bertner / Scorpion feeding on prey, seen under UV light, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Scorpion feeding on prey, seen under UV light, Jatun Sacha Biological Reserve, Ecuador

Paul Bertner / Scorpion, seen under UV light, Ranomafana National Park, Madagascar

Paul Bertner / Scorpion, seen under UV light, Ranomafana National Park, Madagascar

Paul Bertner / Scorpion, seen under UV light, Ranomafana National Park, Madagascar

Paul Bertner / Millipede, seen under UV light, Cuc Phuong National Park, Vietnam

Paul Bertner / Millipede, seen under UV light, Mindo Cloud Forest, Ecuador

Paul Bertner / Caterpillars, seen under UV light, Cuc Phuong National Park, Vietnam

Paul Bertner / Hawk Moth (Sphingidae) caterpillar, seen under UV light, Cuc Phuong National Park, Vietnam

Juergen Freund / Timelapse of a Scolymia coral (Mussidae) feeding, lit with a UV light, Cairns, North Queensland, Australia.

Joao Burini / Fluorescent mushrooms glowing in ultraviolet light. South-east Atlantic forest, Sao Miguel Arcanjo, Sao Paulo, Brazil.

Adrian Davies / Longhorn grasshopper (Deispona sp) at night lit by UV light. Mt Kinabalu, Sabah, Borneo. See 1597584 for comparison without UV light.

Floris van Breugel / Carbonate minerals in ancient volcano north of Lake Mono, seen here at night under ultraviolet illumination. Mono Lake, California, USA. June 2017.

Emanuele Biggi / Scorption (Parabuthus granulatus) under UV light, Namibia.

Emanuele Biggi / Palmated gecko (Pachydactylus rangei) with fluorescent body areas when illuminated by UV torch, Namibia

Emanuele Biggi / Palmated gecko (Pachydactylus rangei) with fluorescent body areas when illuminated by UV torch, Namibia

Nick Garbutt / Borneo giant forest scorpion (Heterometrus longimanus) resting inside a fallen hollow log. Danum Valley, Sabah, Borneo. Photographed with natural light and then illuminated with UV light.

Nick Garbutt / Borneo giant forest scorpion (Heterometrus longimanus) resting inside a fallen hollow log. Danum Valley, Sabah, Borneo. Photographed with natural light and UV light, see 1588717 for a comparative imag...

Nick Garbutt / Comparison of two pictures of Borneo giant forest scorpion (Heterometrus longimanus) resting inside a fallen hollow log. Danum Valley, Sabah, Borneo. Photographed with natural light and then illuminat...

Paul Bertner / Stick Insect (Necroscia punctata), photographed under UV light, Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Scorpion, photographed under UV light, Ranomafana National Park, Madagascar

Paul Bertner / Scorpion (Lychas asper) feeding on another scorpion, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Scorpion (Babycurus gigas) feeding on another scorpion, photographed under UV light, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Mantid (Theopompa sp), photographed under UV light, Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Mantid (Theopompa sp), photographed under UV light, Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Paul Bertner / Katydid (Cratioma borneense), photographed under UV light, Mount Kinabalu National Park, Sabah, Borneo, Malaysia

Paul Bertner / Harvestman (Cosmetidae), photographed under UV light, Leticia, Amazon, Colombia

Paul Bertner / Horned Leaf Chameleon (Brookesia superciliaris), photographed under UV lights, Ranomafana National Park, Madagascar

Paul Bertner / Leaf Beetle (Chrysomelidae), photographed under UV light, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Katydid (Platyphyllum obtusum), photographed under UV light, Leticia, Amazon, Colombia

Paul Bertner / Leaf Katydid (Typophyllum bolivari) female, photographed under UV light, Amazon, Ecuador

Paul Bertner / Saturniid Moth (Gonimbrasia zambesina) caterpillar, photographed under UV light, Udzungwa Mountains National Park, Tanzania

Paul Bertner / Short-nosed Chameleon (Calumma gastrotaenia), photographed under UV light, Andasibe-Mantadia National Park, Antananarivo, Madagascar

Paul Bertner / Caterpillar photographed under UV light, Vietnam

Paul Bertner / Tessaratomid (Tessaratoma sp), photographed under uv light, Cuc Phuong National Park, Vietnam

Paul Bertner / Black Caiman (Melanosuchus niger) young, photographed under UV light, Yasuni National Park, Ecuador

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Bearded fireworm (Hermodice carunculata) photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Bearded fireworm (Hermodice carunculata) photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Bearded fireworm (Hermodice carunculata) photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Solvin Zankl / Fluorescent coral photographed with ultraviolet / UV light, Bonaire, Leeward Antilles, Caribbean region, Netherlands Antilles

Juergen Freund / Rainforest scorpion glowing blue in UV light at night. Queensland, Australia.

Alex Hyde / Photographer Alex Hyde identifying moths attracted to a UV light trap at night in the rainforest, Cordillera de Talamanca mountain range, Caribbean Slopes, Costa Rica. May 2014

Alex Hyde / Photographer Alex Hyde identifying moths attracted to a UV light trap at night in the rainforest, Cordillera de Talamanca mountain range, Caribbean Slopes, Costa Rica. May 2014

Alex Hyde / Moths attracted to light trap in the rainforest at night, Cordillera de Talamanca mountain range, Caribbean Slopes, Costa Rica.

Adrian Davies / Scorpion (Heterometrus sp) fluorescing in ultraviolet light at night on forest floor, Danum Valley, Sabah, Borneo

Albert Lleal / Tube-dwelling Anemone (Cerianthus membranaceus) showing fluorescence under ultraviolet light

Adrian Davies / Yellow-Tailed Scorpion (Euscorpius flavicaudis) under UV light, Provence, France.

Michael D. Kern / Emperor scorpion (Pandinus imperator) glowing blue under UV light, captive

Michael D. Kern / Emperor scorpion (Pandinus imperator) glowing blue under UV light, captive

Albert Lleal / Scorpion (Euscorpius flavicaudis) showin fluorescence under ultraviolet light, Cadaques, Cap de Creus, Catalonia, Spain

Floris van Breugel / Green fluorescent proteins, naturally produced by sea anemones, emit green visible light under ultraviolet light seen here in their natural habitat under the stars on the coast of Olympic National Par...

Floris van Breugel / Various fluorescent minerals, under UV light including, Willemite, Aragonite, Fluorite and Zircon. See image 1434814 for specific identifications and country of origins.

Adrian Davies / Emperor Scorpion (Pandinus imperator) fluorescing under ultraviolet light

Adrian Davies / Emperor Scorpion (Pandinus imperator) fluorescing under ultraviolet light

Michael Durham / Emperor Scorpion (Pandinus imperator) under ultraviolet light, native to Africa