David Fleetham / Polka-Dot / Spotted batfish (Ogcocephalus radiatus) resting on seabed. Florida, USA.

David Fleetham / Polka-Dot Batfish (Ogcocephalus radiatus), Florida, USA.

Melvin Grey / Polka-dot tree frog (Hypsiboas punctatus) adult on leaf, Amazon, Ecuador. June.

Paul Bertner / Polka-dot Treefrog (Hypsiboas punctatus), Manu National Park, Peru

Paul Bertner / Polka-dot Treefrog (Hypsiboas punctatus), Manu National Park, Peru

Juergen Freund / Polka dots beetle weevil (Pachyrrhynchus congestus) Queensland, Australia.

Sean Crane / Polka-dot Treefrog (Hypsiboas punctatus), Madidi National Park, Bolivia

Sean Crane / Polka-dot Treefrog (Hypsiboas punctatus), Madidi National Park, Bolivia

Bert Willaert / Polka dot treefrog (Hypsiboas punctatus) taken against white background, Bolivia.

Pete Oxford / Polka-dot Treefrog (Hypsiboas punctatus), Napo River, Yasuni National Park, Amazon, Ecuador

Pete Oxford / Polka Dot Moth (Pantherodes pardalaria), Mindo Cloud Forest, western slope of Andes, Ecuador

Robert Thompson / Polka dot wasp moth {Syntomeida epilais} Florida, USA, September

Thomas Marent / Polka-dot Treefrog (Hypsiboas punctatus) on leaf, Manu National Park, Peru

Nigel Cattlin / Glasshouse mealybug (Pseudococcus viburni) infesting the swollen stem of a Bunny-ears cactus, (Opuntia microdasys).

Norbert Wu / Polka-dot Batfish (Ogcocephalus radiatus), West Palm Beach, Florida

Steven David Miller / Polka dot wasp moth {Syntomeida epilais jucundissima} male on Oleander flower, Florida, USA

Emanuele Biggi / Polka-dot tree frog (Boana punctata) sitting on leaf, Villa Carmen Biological Station, Peru.

Emanuele Biggi / Polka-dot tree frog (Boana punctata) under normal lighting, Villa Carmen Biological Station, Peru. Sequence 1/2.

Emanuele Biggi / Polka-dot tree frog (Boana punctata) fluorescing under UV lighting, Villa Carmen Biological Station, Peru. Sequence 2/2. New Discovery. Fluorescence only recently discovered.

Emanuele Biggi / Polka-dot tree frog (Boana punctata) fluorescing under UV lighting, Villa Carmen Biological Station, Peru. Sequence 2/2. Fluorescence only recently discovered.

Emanuele Biggi / Polka-dot tree frog (Boana punctata) under normal lighting, Villa Carmen Biological Station, Peru. Sequence 2/2.

Emanuele Biggi / Polka dot tree frog (Boana punctata) camouflaged against underside of leaf, Villa Carmen Biological Station, Peru

Emanuele Biggi / Polka dot tree frog (Boana punctata) sitting on leaf and looking forward, Villa Carmen Biological Station, Peru.

Daniel Nunez / Dotted tree frog (Boana punctata) portrait, Amazon rainforest, Loreto, Peru. Cropped.

David Fleetham / Polka-dot batfish (Ogcocephalus radiatus) resting on the seabed using modified fins, Florida, USA, Atlantic Ocean.

Barry Mansell / Polka dot wasp moth (Syntomeida epilais) resting on leaf. Native to the Caribbean, introduced to Florida, USA. Controlled animal.

Barry Mansell / Polka dot wasp moth caterpillar (Syntomeida epilais) Florida, USA.

David Fleetham / The Polka-dot / Spotted batfish (Ogcocephalus radiatus) resting on the sea floor, Florida, USA. January.

Nick Upton / Angel wings / Polka-Dot cactus (Opuntia microdasys albispina), a Mexican species, close up of spine clusters, Botanicactus Botanic Gardens, See Salines, Mallorca, August.

Nick Upton / Angel wings / Polka-Dot cactus (Opuntia microdasys albispina), a Mexican species, Botanicactus Botanic Gardens, Ses Salines, Mallorca, August.