1348-1905 - Dental panoramic x-ray. In blue, the wisdom teeth ; in yellow the permanent teeth that push the baby teeth.

1348-1903 - Dental panoramic x-ray. In blue, the wisdom teeth.

1348-1904 - Dental panoramic x-ray. In blue, the wisdom teeth.

1348-1900 - Dental panoramic x-ray. In red, the wisdom teeth ; in blue the permanent teeth that push the baby teeth.

860-289001 - Blue-tailed Unicornfish (Naso caeruleocauda) school of fish, Raja Ampat, Indonesia

860-288934 - Blue tits (Cyanistes caeruleus) perched on an old heart-shaped padlock

860-288956 - Blue tit (Cyanistes caeruleus) perched on an old padlock

860-288958 - Blue tit (Cyanistes caeruleus) in flight, England

860-289116 - 'Blue de Solaize' leek, an ideal rustic variety for beginners

860-288845 - Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

860-289068 - Fescue (Festuca glauca) 'Intense blue'

860-288846 - Blue shark (Prionace glauca) Pico Island, Azores, Portugal, Atlantic Ocean

860-288847 - Blue shark (Prionace glauca) with fishing hook and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

860-288935 - Blue tit (Cyanistes caeruleus) and Great tit (Parus major) fighting in the air, England

860-288710 - Plains zebra (Equus quagga burchellii) standing on a rock isolated in blue sky in Kruger National park, South Africa

860-288805 - Blue throat (Luscinia svecica) male singing in the mid-mountain piornal, Sierra de Gredos, Avila, Spain

860-288914 - Portrait of a Scallop, Blue Heron Bridge, Lake Worth Lagoon, Riviera Beach, Florida, USA, Atlantic Ocean.

860-288747 - Lion (Panthera leo) lioness pursuing a Blue wildebeest (Connochaetes taurinus), Masai Mara, Kenya.

1311-348 - Flat top hoodoo on the edge of a cliff along the Billings Gap Trail on Blue Mesa. Petrified Forest National Park Arizona.

1311-347 - A hoodoo on a cliff along the Blue Mesa in Petrified Forest National Park Arizona shaped like a table top.

1311-349 - Natural stone bridge of petrified wood called Keystone Bridge. Located on Blue Mesa in Petrified Forest National Park Arizona.

718-2698 - Blue jeans dart frog (Dendrobates pumilio) on a leaf, Costa Rica, Central America,

1311-346 - A sheer cliff of rock jutting out from the Blue Mesa along the Billings Gap Trail in Petrified Forest National Park Arizona.

1311-345 - An eroded sandstone formation below the Blue Mesa in Petrified Forest National Park Arizona called a Sandcastle.

1311-343 - Panorama of 3 hoodoos on the edge of the Blue Mesa in Petrified Forest National Park Arizona that are shaped like kings.

1311-342 - A rock hoodoo along the base of Blue Mesa in Petrified Forest National Park Arizona shaped like a horse head.

1311-344 - A giant petrified log on a sandstone pedestal on the edge of the Blue Mesa in Petrified Forest National Park Arizona.

718-2658 - Great blue heron (Ardea herodias) looking for food, Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, USA

1179-5128 - Hiker with head torch admiring the blue hour from cliffs at Miradouro Do Guindaste viewpoint, Madeira island, Portugal

805-290 - Khushbagh, Garden of Happiness, enclosing the tombs of Siraj-ud-Daulah and his family, Murshidabad, West Bengal, India, Asia

805-301 - Beautiful red brick late 15th century Lattan mosque, remains of glazed colour on some bricks still visible, Gaur, West Bengal, India, Asia

805-58 - Woman sitting in late afternoon sunshine against blue house wall in Mali tribal village, Jeypore district, Orissa, India, Asia

805-530 - Arched Moghul folly in a quiet garden, Haryana, India, Asia

805-479 - Hindu deities Lord Krishna and his consort Radha in the shrine at Lalji Mandir, Kalna, West Bengal, India, Asia

805-323 - Bonda tribeswoman wearing blue cotton shawl over traditional bead costume, with beaded cap, large earrings and metal necklaces, Rayagader, Orissa, India, Asia

805-92 - Village of stilted houses on the banks of the Rejang River, Sarakei district, Sarawak, Malaysian Borneo, Malaysia, Southeast Asia, Asia

805-476 - Hindu deities Lord Krishna and his consort Radha in the Lalji Mandir shrine, one of the terracotta temples at Kalna, West Bengal, India, Asia

805-475 - Hindu deities Lord Krishna and his consort Radha in the Lalji Mandir shrine, one of the terracotta temples at Kalna, West Bengal, India, Asia

805-573 - Woman in blue patterned sari weaving at loom in rough village shack, Naupatana weaving village, rural Orissa, India, Asia

805-298 - Octagonal Firoj minar in 12th century Gaur, once one of India's great cities, West Bengal, India, Asia

805-322 - Bonda tribeswoman wearing grey blue cotton shawl and beads with beaded cap, large earrings and metal necklaces at weekly market, Rayagader, Orissa, India, Asia

805-318 - Bonda tribeswoman wearing blue cotton shawl over traditional bead costume, with beaded cap, large earrings and metal necklaces, Rayagader, Orissa, India, Asia

805-283 - Deities Sri Krishna and Sri Radhika (Radha) in the Lalji temple, Kalna, West Bengal, India, Asia

1179-5122 - White sand dunes meeting the blue Atlantic Ocean, aerial view, Corralejo Nature Park, Fuerteventura, Canary Islands, Spain

1116-49682 - A windsurfer rides the breaking waves, Kihei, Maui, Hawaii, United States of America

1116-49097 - Man exploring an ice cave, South Coast, Iceland

1116-49665 - A close look into the eyes of a Green sea turtle (Chelonia mydas), an endangered species, Philippines

1116-49736 - A double rainbow over the coastline of a Hawaiian island with mountains and turquoise water, Haena, Kauai, Hawaii, United States of America

1116-49115 - Silhouette of a cowboy riding a horse against a blue sky with cloud, Montana, United States of America

1116-49266 - The monument to General Antonio Maceo and the Calixto Garcia Monument on the Malecon, Havana, Cuba

1116-49706 - Mr. Fleetham spent an afternoon photographing these Atlantic Spotted Dolphin (Stenella plagiodon). During the several hours in the water a group of Atlantic Bottlenose Dolphin (Tursiops truncates) joined the company for nearly an hour of inter-species exchange, Bahamas

1116-49093 - Man exploring an ice cave, South Coast, Iceland

1116-49041 - A sign saying 'Relax' in lettering, Hetton Hall, Northumberland, England

1116-49103 - Exploring a canyon with frozen waterfall in winter, Jasper National Park, Alberta, Canada

1116-49085 - Split view of the palm trees along the coastline and underwater, Maui, Hawaii, United States of America

1116-49331 - Blue wildebeest (Connochaetes taurinus) stands in profile on grass, Serengeti, Tanzania

1116-49649 - Waves off the Na Pali coast of Kauai, Kauai, Hawaii, United States of America

1116-49690 - Alpine glow in the Rocky Mountains, British Columbia, Canada

1116-49715 - Green sea turtles (Chelonia mydas), an endangered species, Hawaii, United States of America

1116-49072 - Glamour shot of girl with butterflies on a blue background, Toronto, Ontario, Canada

1116-49371 - Ruppell long-tailed starling (Lamprotornis purpuroptera) perched on termite mound, Serengeti, Tanzania

1116-49398 - A popular restaurant is reflected on the Columbia River, Astoria, Oregon, United States of America

1116-49303 - Lappet-faced vulture (Torgos tracheliotos) on thornbush under blue sky, Serengeti, Tanzania

1116-49663 - Venomous Banded yellow-lipped sea snake (Laticauda colubrina), also known as a sea krait, Philippines

1116-49251 - Port Mann Bridge at dusk, viewed from Surrey looking into Coquitlam, Surrey, British Columbia, Canada

1116-49088 - An underwater close-up view of a Hawaiian Green Sea Turtle (Chelonia mydas), Makena, Maui, Hawaii, United States of America

1116-49708 - An aerial panoramic view of world famous Ka'anapali Beach from one end to the other with hotels and West Maui Mountains in the background, Maui, Hawaii, United States of America

1116-49312 - Black-headed heron (Ardea melanocephala) stands on stump in silhouette, Serengeti, Tanzania

1116-49101 - A young man holds a pail and a handful of roasted white ants (Isoptera), Gulu, Uganda

1116-49372 - Spider-Man agama (Agama mwanzae) lizard basks on sunlit rock, Serengeti, Tanzania

1116-49329 - Black-chested snake-eagle l(Circaetus pectoralis) looking down from leafy treetop, Serengeti, Tanzania

1116-49684 - A windsurfer rides the breaking waves, Kihei, Maui, Hawaii, United States of America

1116-49729 - Young woman in red bikini snorkels over coral reef, Molokini, Hawaii, United States of America

1116-49260 - The monument to General Antonio Maceo on the Malecon, Havana, Cuba

1116-49691 - Height of the Rockies Provincial Park, British Columbia, Canada

1116-49657 - View from the water of the Manta Ray Bay Resort and it's floating restaurant 'The Mnuw', Yap, Micronesia

1116-49143 - Icebergs at the glacial lagoon Jokulsarlon, Southern Iceland, Iceland

1116-49082 - A male scuba diver in bright blue water, Makena, Maui, Hawaii, United States of America

1116-49354 - Two Fischer's lovebirds (Agapornis fischeri) perched in thorn tree, Serengeti, Tanzania

1116-49279 - Elephant herd (Loxodonta africana) cross grassy plain in sunshine, Serengeti, Tanzanai

1116-49094 - Man exploring an ice cave, South Coast, Iceland

1116-49711 - An aerial view of Balicasag Island, a tiny island in South West Bohol in the central Philippines. It is famous for scuba diving on the deep, vertical walls and there are some fantastic hard coral gardens at snorkeling depths, Balicasag Island, Philippines

1116-49667 - A photographer lines up with a camera in a housing to shoot a large red soft coral fan, Indonesia

1116-49056 - Confederation Bridge, Prince Edward Island, Canada

1116-49680 - A young man in a bathing suit stands on the volcanic rock on the shore capturing the golden sunset with a smart phone camera, Kihei, Maui, Hawaii, United States of America

1116-49262 - Monument to the Victims of the USS Maine, Havana, Cuba

1116-49293 - Blue wildebeest (Connochaetes taurinus) stands on sunset horizon silhouetted, Serengeti, Tanzania

1116-49149 - Northern Hawk Owl (Surnia ulula), known for sitting on the highest perch possible while looking for prey such as voles moving below. This one sits on the top of a tree against a blue sky, South-central Alaska, Anchorage, Alaska, United States of America

1116-49669 - Divers exploring the prop and rudder at the stern of The Carthaginian, a Lahaina landmark, that was sunk as an artificial reef off Lahaina, Maui, Hawaii in December 2005, Maui, Hawaii, United States of America

1116-49728 - Divers on a WW II Corsair fighter plane off Southeast Oahu, Oahu, Hawaii, United States of America

1116-49683 - Two windsurfers ride the breaking waves, Kihei, Maui, Hawaii, United States of America

1116-49086 - Silhouette of a scuba diver in a cave, Makena, Maui, Hawaii, United States of America

1116-49186 - Upper Royal Basin with The Needles and Mt. Clark in the background, Olympic Mountains, Olympic National Park, Washington, United States of America

1116-49676 - A photographer under a massive school of millions of sardines, Moalboal, Cebu, Central Visayas, Philippines

1116-49697 - A surfer on the breaking waves close to the shore of Kaupo Cove, with bright blue water and sky on the horizon, Oahu, Hawaii, United States of America

1116-49261 - The monument to General Antonio Maceo on the Malecon, Havana, Cuba

1116-49389 - Ethiopian Orthodox cross atop of the Cathedral of Tsion Maryam (Our Lady Mary of Zion), Axum, Tigray Region, Ethiopia

1116-49089 - An underwater close-up view of a Hawaiian Green Sea Turtle (Chelonia mydas), Makena, Maui, Hawaii, United States of America

1116-49704 - Tourists along the waterfront of Waikiki at sunrise with a golden sun rising above the ocean, Honolulu, Oahu, Hawaii, United States of America

1116-49095 - Man exploring an ice cave, South Coast, Iceland