Inaki Relanzon / Ring-tailed lemur (Lemur catta) Anja Private Reserve, near Ambalavao, Central Madagascar.

Alex Mustard / Bue ring octopus (Hapalochlaena lunulata) walking across the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Alex Mustard / Blue ring octopus (Hapalochlaena lunulata) walks across the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Alex Mustard / Large blue ring octopus (Hapalochlaena lunulata) swimming just above the sea bed. Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea, tropical west Pacific Ocean.

Heather Angel / Wasp walking around a Spanish love-in-a-mist (Nigella hispanica) flower to sip nectar from ring of blue nectaries, thorax and abdomen pick up pollen from downward facing anthers that swipe over the wa...

David Hall / Poison ocellate octopus (Amphioctopus mototi) with blue ring which appears when disturbed. Pantar, Alor Archipelago, Indonesia.

David Hall / Poison ocellate octopus (Amphioctopus mototi), warning colouration with blue ring and stripes. Pantar, Alor Archipelago, Indonesia.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), portrait, sunbathing in early morning with arms outstretched. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta), three sitting sunbathing in early morning. Anja Community Reserve, Madagascar.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) sunbathing on rock in early morning, granite mountain in background. Anja Community Reserve, Madagascar. 2018.

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

Ashish & Shanthi Chandola / Rose-ringed parakeet (Psittacula krameri) perched on orange flowers. Bandipur National Park, Nilgiri Biosphere Reserve, Karnataka, India.

Konrad Wothe / Wood pigeon (Columba palumbus) in flight, France, June.

Georgette Douwma / Rose-ringed or ring-necked parakeet (Psittacula krameri), blue mutation on bird feeder in garden, with normal coloured parakeet in background. London, UK. The blue bird is ringed, possibly an escape...

Georgette Douwma / Rose-ringed or ring-necked parakeet (Psittacula krameri), blue mutation squabbling with normal coloured parakeet on bird feeder in garden. London, UK. The blue bird is ringed, possibly an escapee fr...

Roger Powell / Collared dove pair (Streptopelia decaocto) in courtship flight. Alentejo, Portugal

Alex Mustard / Blue ring angelfish (Pomacanthus annularis) swimming in front of soft corals. Triton Bay, Kaimana, West Papua, Indonesia. Arafur Sea, Tropical West Pacific Ocean.

David Pattyn / Ring tailed lemur (Lemur catta) feeding on cactus, Berenty Private Reserve, southern Madagascar.

Georgette Douwma / Blue-ringed butterflyfish (Pomacanthus annularis) swimming over soft corals. Andaman Sea, Thailand.

Pascal Kobeh / Ring angelfish (Pomacanthus annularis) Sri Lanka. Indian Ocean.

Pascal Kobeh / Close-up of the head of a Yellowfin surgeonfish (Acanthurus xanthopterus) Maldives, Indian Ocean.

Neil Aldridge / Ring-necked pheasant (Phasianus colchicus) male displaying on a fallen log, among bluebells during spring in woodland on shooting estate, southern England, UK. April.

Neil Aldridge / Ring-necked pheasant (Phasianus colchicus) male displaying on a fallen log, among bluebells during spring in woodland on shooting estate, southern England, UK. April.

Neil Aldridge / Ring-necked pheasant (Phasianus colchicus) male displaying among bluebells, woodland on shooting estate, southern England, UK. April.

Neil Aldridge / Ring-necked pheasant (Phasianus colchicus) male displaying among bluebells, woodland on shooting estate, southern England, UK. April.

Cyril Ruoso / Ringed-tailed lemur (Lemur catta) male sunbathing, Berenty reserve, Madagascar

Ernie Janes / Wood pigeon (Columba palumbus) in flight, Norfolk, England, UK, April.

Ernie Janes / Wood pigeon (Columba palumbus) in flight, Norfolk, England, UK, April.

Ernie Janes / Wood pigeon (Columba palumbus) in flight against blue sky, Norfolk, England, UK. July.

Pete Oxford / Pastel ring wrasse (Hologymnosus doliatus) Rainbow Reef, Fiji, South Pacific.

Philippe Clement / Songbirds - Robin (Erithacus rubecula), Blue tits (Cyanistes caeruleus), Eurasian collared dove (Streptopelia decaocto), Crested tit (Lophophanes cristatus) and Great tits (Parus major) feeding on nut...

Alex Mustard / Poison ocellate octopus (Amphioctopus siamensis) moves across the sand. When disturbed, this species advertises its poisonous nature by flashing Blue ring on the dark patch beneath the eye. Lembeh Str...

Alex Mustard / Tropical blue ring octopus (Hapalochlaena lunulata) is small but has one of the most venomous creatures in the ocean, its bite injects a neurotoxin that paralyses its victim. It flashes its blue rings...

Alex Mustard / A blue ring octopus (Hapalochlaena lunulata) flashes its blue rings as it crawls over a coral reef. Kapalai Island, Sulu Sea, Sabah, Borneo, Malaysia..

Alex Mustard / An undescribed species of blue ring octopus (Hapalochlaena sp.) swimming at night. Java Sea, Puri Jati, Bali, Indonesia. South East Asia.

Alex Mustard / Southern / pacific blue-ringed octopus (Hapalochlaena maculosa) swims across the seabed. Port Philip Bay, Blairgowrie, Melbourne, Victoria, Australia.

Jeff Rotman / Scientist holding a poisonous Pacific blue-ringed octopus (Hapalochlaena maculosa) in his hand. The octopus can emmit a fatal neurotoxin through it's saliva when provoked, and there is no known anti-v...

Nick Upton / 2020VISION / Four juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project, identifiable by colour ring combinations as Clarence, Reg, Twinkle and Monty, with adult plumage developing at t...

Nick Upton / 2020VISION / Three juvenile Common / Eurasian cranes (Grus grus) released by the Great Crane Project, identifiable by colour ring combinations as Clarence, Reg and Twinkle, with adult plumage developing at ten mon...

Tim Laman / Blue Ring Angelfish (Pomacanthus annularis) portrait, Raja Ampat Islands, West Papua Province, Indonesia. April 2007

Claudio Contreras / Blue footed booby (Sula nebouxii) close-up of blue feet with a ring on leg, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico, December

Jeff Rotman / Blue-Ring Octopus (Hapalochlaena maculosa) swimming at night, Eastern Australia, Pacific Ocean.

Brent Hedges / Blue-ringed Octopus (Hapalochlaena maculosa) South Australia, Australia

Fred Bavendam / Southern Blue-ringed Octopus (Hapalochlaena maculosa) female carrying her eggs rather thanlaying them in a location, Edithburg, Australia

Fred Bavendam / Southern Blue-ringed Octopus (Hapalochlaena maculosa) female carrying her eggs rather than laying them in a location, Edithburg, Australia

GEORGETTE DOUWMA / Pacific blue ring octopus {Hapalochlaena maculosa} Sulawesi, Indonesia

Fred Bavendam / Southern Blue-ringed Octopus (Hapalochlaena maculosa) has a venomous bite that can be fatal to humans but it is very unaggressive, South Australia

Fred Bavendam / Blue-ringed Angelfish (Pomacanthus annularis), Andaman Sea, Thailand

Jeff Rotman / Poisonous Blue-ringed octopus {Hapalochlaena maculosa} jets away at night, Australia

Jeff Rotman / Poisonous Blue-ringed octopus {Hapalochlaena maculosa} jets away at night, Australia

Jeff Rotman / Pacific Blue Ring Octopus at night in defence posture. Sydney Australia Hapalochlaena maculosa

Jeff Rotman / Pacific Blue ring octopus {Hapalochlaena maculosa} Eastern Australia, Pacific Ocean

Juergen Freund / Pacific blue ring octopus {Hapalochlaena maculosa} Indo Pacific

Jeff Rotman / Pacific blue ring octopus at night (Hapalochlaena maculosa) Australia

Constantinos Petrinos / Pacific blue ring octopus {Octopus maculosa / lunulata} note enlarged blue rings of agitated animal; toxic species. Lembeh, Sulawesi, Indonesia. Colour change Sequence.

Constantinos Petrinos / Pacific blue ring octopus {Octopus maculosa / lunulata} has blue rings that enlarge when agitated; toxic species. Sulawesi, Indonesia. Colour change Sequence.

Juergen Freund / Pacific blue ringed octopus {Hapalochlaena maculosa} Sulu-sulawesi seas, Indo-Pacific

David Fleetham / Pacific blue ring octopus (Hapalochlaena maculosa) on orange sponge, South Australia.

Kevin Schafer / Ring-tailed Pigeon (Columba caribaea), Blue and John Crow Mountains National Park, Jamaica

Kevin Schafer / Ring-tailed Pigeon (Columba caribaea), Blue and John Crow Mountains National Park, Jamaica

Kevin Schafer / Ring-tailed Pigeon (Columba caribaea), Blue and John Crow Mountains National Park, Jamaica

Kevin Schafer / Ring-tailed Pigeon (Columba caribaea), Blue and John Crow Mountains National Park, Jamaica

Nature Production / Pacific Blue-ringed Octopus {Hapalochlaena fasciata} Izu Osezaki, Shizuoka, Japan, January

Norbert Wu / Blue-ringed Angelfish (Pomacanthus annularis) in cave, Raja Ampat Islands, Indonesia

Carine Schrurs / Pacific blue ring octopus swimming {Hapalochlaena maculosa} Sulawesi Indonesia

Carine Schrurs / Pacific blue ring octopus on coral {Hapalochlaena maculosa} Lembeh strait Sulawesi

Joel Sartore / Photo Ark / Blue ring angelfish (Pomacanthus annularis) portrait, Omaha's Henry Doorly Zoo and Aquarium. Captive, occurs in Indo-Pacific.

Nick Upton / Collared dove (Streptopelia decaocto) perched on a tree branch, Gloucestershire, UK, August.

Brian Bevan / Tracking shot of Common pheasant (Phasianus colchicus) male walking through frosty meadow and jumping on tussock, before jumping off and pecking at ground, Bedfordshire, UK.

Roger Powell / White-breasted kingfisher (Halcyon smyrnensis) with ring, calling in reed bed beside stream, after bathing, K'Far Ruppin kibbutz, Jordan Valley, Israel, March.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female, carrying eggs, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, resting on seabed, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, drifitng in open ocean, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) investigating several bivalve shells on seabed, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, resting on seabed, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, resting on seabed, Edithburgh, South Australia, Great Australian Bight.

Fred Bavendam / Southern blue-ringed octopus (Hapalochlaena maculosa) female carrying eggs, resting on seabed, Edithburgh, South Australia, Great Australian Bight.

Doug Perrine / Panoramic view of the stony beach fronting the southern slopes of Haleakala Mountain, recent rains have washed soil from the slopes down gullies and into the ocean, creating a muddy ring that threaten...

SCOTLAND: The Big Picture / Ecologist ringing a Blue tit (Cyanistes caeruleus) chick as part of a population survey, Inverness, Scotland, UK. June. Model released.

Nick Upton / Wood pigeon (Columba palumbus) perched in a Beech tree (Fagus sylvatica) feeding on buds, Wiltshire, UK, April.

Georgette Douwma / Blue-ringed angelfish (Pomacanthus annularis) composite image on black background, Indonesia, Indo-Pacific.

Georgette Douwma / Tropical angelfish composite image on black background, Blue-ringed angelfish (Pomacanthus annularis), Semicircle angelfish (Pomacanthus semicirculatus), Blacktail angelfish (Centropyge eibli), Regal...

Alex Mustard / Ring of Blue mussels (Mytilus edulis), Common limpets (Patella vulgata) and Black-footed limpets (Patella depressa), Cornwall, UK, English Channel.

Alex Mustard / Blue ring octopus (Hapalochlaena lunulata) patrols the seabed. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Nick Upton / Wood pigeon (Columba palumbus) juvenile swallowing Morello cherry (Prunus cerasus). Wiltshire, England, UK. June.

David Fleetham / Yellowfin surgeonfish (Acanthurus xanthopterus) female at a cleaning station with endemic Hawaiian cleaner wrasse (Labroides phthirophagus) Hawaii.

Edwin Giesbers / Peregrine falcon (Falco peregrinus) in flight with open beak. The Netherlands. May.

Nick Upton / Wood pigeon (Columba palumbus) perched on a cottage roof with its eyes shut, Gloucestershire UK, February.

Oscar Dewhurst / Ring-necked parakeet (Psittacula krameri) perched on dead tree branch against blue sky. London, England, UK, October.

John Cancalosi / Ring-billed gull (Larus delawarensis), adult in flight, New York, USA

Georgette Douwma / Blue-ring sea squirt (Clavelina coerulea). Derawan Island, East Kalimantan, Indonesia.

Georgette Douwma / Blue-ring sea squirt (Clavelina coerulea) clustered around another Sea squirt. Derawan Island, East Kalimantan, Indonesia.