Eric Baccega / Igloo lit up at night under northern lights (Aurora borealis) Northwest Territories, Canada March 2007

Staffan Widstrand / Polar bear and cub cross crack in ice {Ursus maritimus} Churchill, Canada

Eric Baccega / Igloo under northern lights, Northwest Territories, Canada March 2007

Staffan Widstrand / Polar bear {Ursus maritimus} on pack ice, Churchill, Canada.

Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada

Andy Rouse / Polar Bear (Ursus maritimus) mother with cubs in snow hollow, Canadian Arctic (non-ex)

Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada

Eric Baccega / Polar bears play fighting {Ursus maritimus} Churchill, Manitoba, Canada

David Noton / Alexandra Fiord, Ellesmere Island, Canadian Arctic

David Noton / Arctic landscape with ice floes in Alexandra Fjord, Ellesmere Island Canadian Arctic, North America

Staffan Widstrand / Winter storm -35 C. Ellesmere Island, Northwest Territories, Canada.

David Noton / Alexandra Fjord, Ellesmere Island, Canadian Arctic

Juan Carlos Munoz / Comb crested dragon lizard {Gonocephalus liogaster} on Strangler fig roots, Danum valley forest reserve, Sabah, Borneo, Malaysia

Nick Garbutt / Bornean angle-headed lizard (Gonocephalus bornensis) with mouth open in forest habitat, Danum Valley, Sabah, Borneo, Malaysia

Robert Valentic / Emma gray's forest dragon (Calotes emma emma) female from the botanical garden trail in karst rainforest habitat within the Phong Nha Ke Bang National Park in central Vietnam. Dry season.

Daniel Heuclin / Green crested lizard (Bronchocela cristatella) Gunung Leuser, Sumatra.

Adrian Davies / Borneo angle headed / Long crested forest dragon (Gonocephalus bornensis) Danum Valley, Sabah, Borneo.

Adrian Davies / Borneo angle headed / long crested forest dragon (Gonocephalus bornensis) Danum Valley, Sabah, Borneo.

Adrian Davies / Short crested forest dragon (Gonocephalus liogaster) Danum Valley, Sabah, Borneo.

Adrian Davies / Short crested forest dragon (Gonocephalus liogaster) Danum Valley, Sabah, Borneo.

Adrian Davies / Short crested forest dragon (Gonocephalus liogaster) Danum Valley, Sabah, Borneo.

Adrian Davies / Borneo angle headed / Long crested forest dragon (Gonocephalus bornensis) Danum Valley, Sabah, Borneo.

Michael D. Kern / Kaleidoscope pattern formed from picture of head and legs of Abbot's Angle Headed Lizard (Gonocephalus doriae). See original image number 01482827.

Dong Lei / Emma Gray's forest lizard (Calotes emma), on forest floor. Xishuangbanna National Nature Reserve, Yunnan Province, China. March.

Alex Hyde / Bornean angle-headed lizard / Long-crested forest dragon (Gonocephalus bornensis) juvenile climbing liana vine in tropical rainforest. Danum Valley, Sabah, Borneo.

Chien Lee / Bornean Crested Lizard (Gonocephalus grandis) male sleeping at night on an exposed branch, Tibu, Batang Ai National Park, Malaysia

Michael D. Kern / Angle headed lizard (Gonocephalus doriae) captive, occurs in Indonesia, Malaysia, Thailand.

Dong Lei / Emma Gray's Forest Lizard (Calotes emma) in threat display, Xishuangbanna National Nature Reserve, Yunnan Province, China, March.

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis) at night, Gunung Penrissen, Borneo, Malaysia

Chris Mattison / Borneo Dragon (Gonocephalus borneensis). Danum Valley, Sabah, Borneo.

Sebastian Kennerknecht / Borneo Anglehead Lizard (Gonocephalus bornensis) male on tree, Tawau Hills Park, Sabah, Borneo, Malaysia

Nick Garbutt / Comb crested dragon (Gonocephalus liogaster) male in breeding colours and in aggressive posture. Understorey of lowland rainforest, Maliau Basin, Sabah's 'Lost World', Borneo

Suzi Eszterhas / Borneo Anglehead Lizard (Gonocephalus bornensis), Danum Valley Conservation Area, Malaysia

Christian Ziegler / Borneo Anglehead Lizard (Gonocephalus bornensis) in defensive posture, Lambir Hills National Park, Sarawak, Malaysia

Christian Ziegler / Borneo Anglehead Lizard (Gonocephalus bornensis), Lambir Hills National Park, Sarawak, Malaysia

Chien Lee / Bornean Crested Lizard (Gonocephalus grandis) male, Gunung Mulu National Park, Sarawak, Borneo, Malaysia

Chien Lee / Bornean Crested Lizard (Gonocephalus grandis) male, Gunung Mulu National Park, Sarawak, Borneo, Malaysia

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis), Danum Valley Conservation Area, Sabah, Borneo, Malaysia

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis), Gunung Mulu National Park, Sarawak, Borneo, Malaysia

Chien Lee / Bornean Crested Lizard (Gonocephalus grandis) female, Gunung Gading National Park, Malaysia

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis), Kubah National Park, Malaysia

Thomas Marent / Bornean Crested Lizard (Gonocephalus grandis) young, Forest Research Institute Malaysia, Malaysia

Tim Laman / Portrait of a Comb-crested Agamid / Dragon Lizard (Gonocephalus liogaster) juvenile sleeping on a twig at night in the rainforest of Borneo.

Tim Laman / Head portrait of Bornean angle-headed lizard (Gonocephalus bornensis) on a tree trunk in lowland rainforest (endemic to Borneo) Danum Valley Conservation Area, Sabah, Malaysia.

Tim Laman / Bornean angle-headed lizard (Gonocephalus bornensis) on a tree trunk in lowland rainforest (endemic to Borneo) Danum Valley Conservation Area, Sabah, Malaysia.

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis), Danum Valley Conservation Area, Borneo, Malaysia

Albert Lleal / Bornean Crested Lizard (Gonocephalus grandis) eye, native to Borneo

Albert Lleal / Bornean Crested Lizard (Gonocephalus grandis), native to Borneo

Juan Carlos Munoz / Comb crested dragon lizard {Gonocephalus liogaster} Danum Valley Forest Reserve, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Comb crested dragon lizard {Gonocephalus liogaster} camouflaged on tree trunk, Danum Valley Forest Reserve, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Comb crested dragon lizard {Gonocephalus liogaster} Danum Valley Forest Reserve, Sabah, Borneo, Malaysia

Nick Garbutt / Bornean angle-headed lizard (Gonocephalus bornensis) in rainforest habitat, Danum Valley, Sabah, Borneo, Malaysia

Tony Heald / Borneo angle headed / long crested forest dragon {Gonocephalus bornensis} in rainforest at night, Danum Valley, Sabah, Borneo, September

Tony Heald / Borneo angle headed / long crested forest dragon {Gonocephalus bornensis} in rainforest at night, Danum Valley, Sabah, Borneo, September

Tony Heald / Comb / Short crested Forest Dragon [Gonocephalus liogaster] in rainforest at night, Danum Valley, Sabah, Borneo, September

Nick Garbutt / Comb Crested Dragon (Gonocephalus liogaster), Danum Valley, Sabah, Borneo.

Nick Garbutt / Comb crested forest dragon lizard {Gonocephalus liogaster} sunning on tree, Danum valley, Sabah, Borneo, Malaysia

Nick Garbutt / Short-crested forest dragon / Comb crested dragon lizard {Gonocephalus liogaster} lowland rainforest, Danum Valley, sabah, Borneo.

Nick Garbutt / Short-crested forest dragon / Comb crested dragon lizard {Gonocephalus liogaster} in lowland rainforest, Danum Valley, Sabah, Borneo.

Nick Garbutt / Long-crested Forest Dragon / Borneo angle headed dragon lizard {Gonocephalus bornensis} on branch, Danum Valley, Sabah, Borneo.

Nick Garbutt / Comb crested dragon lizard {Gonocephalus liogaster} Danum valley, Sabah, Borneo

Christian Ziegler / Borneo Anglehead Lizard (Gonocephalus bornensis), Lambir Hills National Park, Sarawak, Malaysia

Chien Lee / Borneo Anglehead Lizard (Gonocephalus bornensis) in defensive posture, Bintulu, Borneo, Malaysia

Robert Valentic / Green crested lizard (Bronchocela rayaensis) female, Khao Phra Thaew NP, Phuket, Thailand. Dry season.

Robert Valentic / Emma gray's forest dragon (Calotes emma emma) Phuket Island, Thailand, Controlled conditions.

Robert Valentic / Crested dragon (Ctenophorus cristatus) male basking on a fallen log in chenopod shrubland habitat near Balladonia, Nullarbor Plain, Western Australia.