Niall Benvie / Boy and girl dragging a Christmas tree home from the forest, Angus, Scotland, UK, January 2010, model released

David Tipling / Pied wagtails (Motacilla alba yarrellii) silhouetted against the moon, roosting in tree in shopping centre. Kent, UK, December

Ernie Janes / Jack russell terrier in box with Christmas tree

Mitsuhiko Imamori / Christmas Tree Firefly (Pyrophanes appendiculata) group lighting up tree at night, southeast Asia

Mitsuhiko Imamori / Christmas Tree Firefly (Pyrophanes appendiculata) at night, southeast Asia

Larry Michael / Christmas tree on edge of coniferous forest Wisconsin, USA

Pat Tuson / Discarded Christmas tree in snow in a Highbury street awaiting a recycling collection, London UK

Pat Tuson / Discarded Christmas tree in snow in a Highbury street awaiting a recycling collection, London Borough of Islington, UK

Yukihiro Fukuda / Red footed booby (Sula sula) brooding egg on nest in tree by beach, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / White capped / Black noddy (Anous minutus) chick in nest in tree, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / White tern (Gygis alba) solitary egg laid in tree hollow, this species does not make nests, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / White terns (Gygis alba) pair sitting in tree, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) chick in tree nest, covered in white feathers as protection against heat of the sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) parent with chick in tree where they nested, chick is covered in white feathers as protection against heat of the sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / White capped / Black noddy (Anous minutus) and Brown noddy (Anous stolidus) resting on tree, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) nesting in tree, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) parent with chick in tree nest, chick is covered with white feathers to protect against heat of sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) incubating egg on nest in tree, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) chick at nest in tree, covered in white feathers as protection against heat of sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Lesser frigatebird (Fregata ariel) adult with chick in tree top nest, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) chick in tree nest, chick is covered with white feathers to protect against heat of sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) parent with chick in tree nest, chick is covered with white feathers to protect against heat of sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) parent with chick in tree nest, chicks covered in white feathers to protect against heat of sun, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / Red footed booby (Sula sula) brooding egg on nest in tree by beach, Christmas Island, Indian Ocean, July

Yukihiro Fukuda / White capped / Black noddies (Anous minutus) and Brown noddies (Anous stolidus) resting in a tree, Christmas Island, Indian Ocean, July

Georgette Douwma / Christmas tree worms (Spirobranchus giganteus) on Porites coral boulder, Andaman Sea, Thailand

Pete Oxford / Christmas tree worm (Spirobranchus giganteus) on Star coral (Montastraea cavernosa) Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas tree worm (Spirobranchus giganteus) on Star coral (Montastraea cavernosa) Bonaire, Netherlands Antilles, Caribbean

Ernie Janes / St James Church at night with Christmas tree and moon, South Repps, Norfolk, UK, December

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Brain Coral (Diploria labyrinthiformis), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Brain Coral (Diploria labyrinthiformis), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) on Brain coral. Punta Gruesa, Mahahual Peninsula, South Yucatan Peninsula, Mexico.

Bryan and Cherry Alexander / A 'christmas tree' being used to cap a well head in the gas fields near Tambey. Yamal Peninsula, Western Siberia, Russia, March 2011

Birgitte Wilms / Christmas Tree Worm (Spirobranchus giganteus) pair filter feeding, Solomon Islands

Juergen Freund / Coral reef in the shallow mangroves with open Christmas tree worms (Spirobranchus giganteus) and reflection on the surface above. North Raja Ampat, West Papua, Indonesia, February 2010.

Juergen Freund / Split-level shot of coral reef in the shallow mangroves with open Christmas tree worms (Spirobranchus giganteus). North Raja Ampat, West Papua, Indonesia, February 2010.

Juergen Freund / Split-level shot of coral reef in the shallow mangroves with open Christmas tree worms (Spirobranchus giganteus). North Raja Ampat, West Papua, Indonesia, February 2010.

Colin Varndell / Holly (Ilex aquifolium) berries and leaves. Dorset, UK, October.

Jim Brandenburg / North star in night exposure on Christmas Eve, Minnesota

Charlie Summers / Christmas Island Goshawk (Accipiter fasciatus natalis) perched in a tree, Christmas Island, Indian Ocean, Australian external territory. Endangered.

Tim Laman / Christmas tree worms (Spirobranchus giganteus) growing on a hard coral, and new species of Dottyback. Pisang Islands, West of Fak Fak Peninsula. West Papua, Indonesia, April 2007

Charlie Summers / Red Land Crabs (Gecarcoidea natalis) crawling over roots of tree, on their migration pathway from the forests to coast, Christmas Island, South East Asia

Mike Potts / Christmas Tree (Nuytsia floribunda) in flower beside flowering Grass trees, North of Perth, Western Australia. December

Mike Potts / Christmas Tree (Nuytsia floribunda) in flower beside flowering Grass trees, North of Perth, Western Australia. December

Sue Daly / Christmas tree worm (Spirobranchus giganteus) Lembeh Straits, Sulawesi, Indonesia

Ingo Arndt / Chinese Banyan Tree (Ficus microcarpa) roots and dead host tree in rainforest, Christmas Island, Indian Ocean, Territory of Australia

Ingo Arndt / Parasol Leaf Tree (Macaranga tanarius) leaf showing ribs and veination, Christmas Island, Indian Ocean, Territory of Australia

Ingo Arndt / Coconut Crab (Birgus latro) on tree trunk, Christmas Island, Indian Ocean, Territory of Australia

Ingo Arndt / Travelers Palm (Ravenala madagascariensis) frond, Christmas Island, Indian Ocean, Territory of Australia

Ingo Arndt / Travelers Palm (Ravenala madagascariensis), Christmas Island, Indian Ocean, Territory of Australia

Ingo Arndt / Parasol Leaf Tree (Macaranga tanarius) leaf showing ribs and veination, Christmas Island, Indian Ocean, Territory of Australia

Claudio Contreras / Christmas tree worm (Spirobranchus giganteus) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Juergen Freund / Christmas tree worms (Spirobranchus giganteus) Indo-pacific

Philippe Clement / Holly leaves and berries (Ilex aquifolium), Belgium

Mark Taylor / Ginger kitten playing with decorations in a Christmas tree.

Mark Taylor / Two Ginger kittens playing with decorations in a Christmas tree.

Mark Taylor / Grey kitten playing with Christmas decorations under a Christmas tree.

Mark Taylor / Grey kitten with christmas decorations under a Christmas tree.

Mark Taylor / Grey kitten playing with decorations on a Christmas tree.

Mark Taylor / Grey kitten with christmas decorations under a Christmas tree.

Ross and Diane Armstrong / Christmas Tree Worm (Spirobranchus giganteus) pair filter feeding, Komodo Island, Indonesia

Gary K. Smith / Mistletoe (Viscum album) with ripe white berries on old apple tree, Norfolk, England, UK, December

Gary K. Smith / Mistletoe (Viscum album) high on Common Lime tree (Tilia vulgaris), Norfolk, England, UK, October

Gary K. Smith / Mistletoe (Viscum album) high on Common Lime tree (Tilia vulgaris), Norfolk, England, UK, October

GEORGETTE DOUWMA / Christmas tree worms (Spirobranchus giganteus) on porites coral. Banda, Moluccas, Indonesia.

Juergen Freund / Christmas tree worm {Spirobranchus giganteus} Indo-pacific

GEORGETTE DOUWMA / Coral reef with christmas tree worms, Similian Islands, Andaman Sea, Thailand.

Juergen Freund / Giant Christmas tree worm {Spirobranchus giganteus} on coral, Caribbean

Dan Burton / Christmas tree worm {Spirobranchus giganteus} Red Sea

Constantinos Petrinos / Christmas tree worm {Spirobranchus giganteus} amongst Orange cup coral {Tubastrea coccinea} Bonaire, Caribbean

Juergen Freund / Coconut crabs on tree trunk {Birgus latro} Christmas Island

Dan Burton / Christmas tree worms (Spirobranchus giganteus), Red Sea

Juergen Freund / Christmas tree worm on coral (Spirobranchus giganteus) Cuba, Caribbean Sea

GEORGETTE DOUWMA / Christmas tree worm {Spirobranchus giganteus} Moluccas, Indonesia Banda Island

GEORGETTE DOUWMA / Christmas tree worms on porites coral. (S.giganteus) Similan Islands Andaman Sea, Thailand

GEORGETTE DOUWMA / Close up of a Christmas tree worm {Spirobranchus giganteus} Andaman Sea Thailand Indian Ocean

GEORGETTE DOUWMA / Porites coral with Christmas tree worms {Spirobranchus giganteus} Similian Is, Thailand

GEORGETTE DOUWMA / Christmas tree worms {Spirobranchus giganteus} Andaman sea, Indonesia

GEORGETTE DOUWMA / Christmas tree worms {Spirobranchus giganteus} Banda, Moluccas, Indonesia

Constantinos Petrinos / Christmas tree worm (Spirobranchus giganteus) amongst Orange cup corals (Tubastrea coccinea) Bonaire, Caribbean

Petra Wegner / Domestic dog, two Cavalier King Charles Spaniels, (tricolor and black and tan) in Christmas setting

Petra Wegner / Domestic dog, Cavalier King Charles Spaniel (Blenheim) sitting one sledge with presents.

Doug Perrine / Christmas tree worms {Spirobranchus giganteus} Mabul Island, Borneo, Malaysia

Birgitte Wilms / Striped Blenny (Meiacanthus grammistes) in its burrow surrounded by Christmas Tree Worms (Spirobranchus giganteus) 40 feet deep, Galapagos Islands, Ecuador

Michael & Patricia Fogden / Christmas Tree (Nuytsia floribunda) and Bluff Knoll, Stirling Range National Park, Western Australia

Chris Newbert / Christmas Tree Worm (Spirobranchus giganteus) and Coral Hermit Crab (Paguritta harmsi) colony, Solomon Islands

Chris Newbert / Christmas Tree Worm (Spirobranchus giganteus) group, Coral Sea

Mitsuhiko Imamori / Christmas Tree Firefly (Pyrophanes appendiculata) group and star trails at night, southeast Asia

GEORGETTE DOUWMA / Christmas tree worm {Spirobranchus giganteus} embedded in live coral.

Juergen Freund / Christmas tree worms. Caribbean

Juergen Freund / Coconut crab on tree trunk, Christmas Island

Larry Michael / Christmas tree on edge of coniferous forest Wisconsin, USA

Roberto Rinaldi / Christmas tree worms (Spirobranchus giganteus)sprouting from brain coral (Faviidae) on a reef, Belize. ^^^The worms open their corkscrew-like plumage to filter plankton and other microscopic nourishme...

Roberto Rinaldi / Christmas tree worms (Spirobranchus giganteus), New Caledonia, Melanesia.