Steven David Miller / Eastern grey kangaroo (Macropus giganteus) male standing, Grampians National Park, Victoria, Australia. December.

Steven David Miller / Eastern grey kangaroo (Macropus giganteus) male scratching stomach, Grampians National Park, Victoria, Australia. December.

Steven David Miller / Eastern grey kangaroo (Macropus giganteus), two males fighting. Grampians National Park, Victoria, Australia.

Steven David Miller / Eastern grey kangaroo (Macropus giganteus), two males fighting. Grampians National Park, Victoria, Australia.

Steven David Miller / Eastern grey kangaroo (Macropus giganteus), two males fighting, evenly matched. Grampians National Park, Victoria, Australia.

Steven David Miller / Eastern grey kangaroo (Macropus giganteus) female with joey in pouch, standing beside tree. Grampians National Park, Victoria, Australia.

Steven David Miller / Red-collared lorikeet (Trichoglossus rubritorquis) pair examining hole in Eucalyptus as a potential nesting hollow. Katherine, Northern Territory, Australia.

Steven David Miller / Great bowerbird (Chlamydera nuchalis), male showing off treasures whilst female inspects bower. Lake Argyle, Kununurra, Western Australia.

Steven David Miller / Olive-backed sunbird (Nectarinia jugularis) female returning to her nest with nesting material, Cape Hillsborough National Park, Queensland, Australia, September.

Steven David Miller / Olive-backed Sunbird (Nectarinia jugularis) female in her nest, Cape Hillsborough National Park, Queensland, Australia, September.

Steven David Miller / Long-nosed potoroo (Potorous tridactylus) feeding on bird seed fallen from bird feeders which encourages them to come out into open woodland. Fences around the property protect them from feral predato...

Steven David Miller / Emu (Dromaius novaehollandiae) juvenile, Cleland Wildlife Park, South Australia, March. Captive.

Steven David Miller / Emu (Dromaius novaehollandiae) juvenile with beak open to catch a leaf, Cleland Wildlife Park, South Australia, March. Captive.

Steven David Miller / Eclectus parrot (Eclectus roratus) female perched in a tree, The Wildlife Habitat Zoo, Port Douglas, Queensland, Australia. August. Captive.

Steven David Miller / Silhouette of an Agile wallaby (Macropus agilis) hopping along the beach at dusk, Cape Hillsborough National Park, Queensland, Australia. September.

Steven David Miller / Sand bubble patterns created by Sand bubbler crabs (Scopimera inflata), Cape Hillsborough National Park, Queensland, Australia. September.

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) on a branch, Cania Gorge National Park, Queensland, Australia. September.

Steven David Miller / A Perentie (Varanus giganteus) using its forked tongue to detect smells, Alice Springs Reptile Centre, Northern Territory, Australia, Captive. May.

Steven David Miller / An Orange lacewing butterfly (Cethosia penthesilea), Cairns Botanical Gardens, Queensland, Australia. Captive. August.

Steven David Miller / A beach at Isthmus Bay provides some good surf waves, Isthmus Bay, Torndirrup National Park, Albany, Western Australia, December

Steven David Miller / Devils Marbles, Devils Marbles Conservation Reserve, Northern Territory, Australia, June 2010

Steven David Miller / Whistling kites (Haliastur sphenurus) two in flight, one with prey in talons, over Corroboree Billabong, Mary River, Northern Territory, Australia

Steven David Miller / Australian freshwater / Johnstone's crocodile (Crocodylus johnsoni) with fish in mouth, a scrap from a fisherman, Lake Kununurra, Western Australia, July

Steven David Miller / Australian freshwater / Johnstone's crocodile (Crocodylus johnsoni) with damaged upper jaw in shallow water waiting for a scrap from a fisherman, Lake Kununurra, Western Australia, July

Steven David Miller / Subtropical rainforest growing in a creek gully, while at higher levels a mixed forest begins. Fraser Island, Queensland, Australia

Steven David Miller / Masked lapwing / plover (Vanellus miles novaehollandiae) chick walking, Hervey Bay, Queensland, Australia

Steven David Miller / A rock art shelter in the northern Kimberley region features a cluster of Wandjina figures peering out from the sandstone rock surface, Northern Kimberley region and the Mitchell Plateau, Western Aust...

Steven David Miller / Large solar panels for generating electricity by solar power, Hermannsburg, west of Alice Springs, Northern Territory, Australia, August 2007

Steven David Miller / Large solar panels for generating electricity by solar power, Hermannsburg, west of Alice Springs, Northern Territory, Australia, August 2007

Steven David Miller / Bradshaw rock art / Gwion Gwion, Northern Kimberley region and the Mitchell Plateau, Western Australia

Steven David Miller / White-lipped / Giant tree frog (Litoria infrafrenata) on palm tree, Cairns, North Queensland, Australia

Steven David Miller / Emu (Dromaius novaehollandiae) walking on road through saltbush habitat, Mungo National Park, New South Wales, Australia, 2007

Steven David Miller / Cattle Egret {Ardea ibis} on nest with chicks, summer, Caversham Wildlife Park, Perth, Western Australia, captive

Steven David Miller / Australian birdwing butterfly {Ornithoptera priamus} male on flower. Captive. Australia.

Steven David Miller / Snorkler at Blue hole, head spring that feeds Ichetucknee river, Florida, USA, Model released

Steven David Miller / Bottlenose dolphin abstract {Tursiops truncatus} Shark Bay, Australia

Steven David Miller / The Pinnacles, remnant columns in an eroded limestone plateau, Nambung National Park, Western Australia

Steven David Miller / Perentie {Varanus giganteus} Northern Territory, Australia, Alice Springs Reptile Park - largest Australian monitor lizard

Steven David Miller / Blue Lake in extinct volcano crater, Mt Gambier. Supplies 36K million litres water to town below. South Australia

Steven David Miller / Cuban tree frog (Osteopilus septentrionalis) native of West Indies introduced into Florida, USA

Steven David Miller / Cairns birdwing butterfly (Ornithoptera euphorion) male resting on leaf. Kuranda Butterfly Sanctuary, Queensland, Australia. Captive.

Steven David Miller / Cairns birdwing butterfly (Ornithoptera euphorion) male resting on leaf. Kuranda Butterfly Sanctuary, Queensland, Australia. Captive.

Steven David Miller / Cairns birdwing butterfly (Ornithoptera euphorion) male resting on leaf. Kuranda Butterfly Sanctuary, Queensland, Australia. Captive.

Steven David Miller / Blue-winged kookaburra (Dacelo leachii) perched on branch, hunting prey below. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Black flying fox (Pteropus alecto) resting in tree within colony. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Black flying fox (Pteropus alecto) resting in tree, scratching itself. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Black flying fox (Pteropus alecto) sleeping in tree roost. Nitmiluk National Park, Northern Territory, Australia.

Steven David Miller / Black flying fox (Pteropus alecto) sleeping in tree roost. Nitmiluk National Park, Northern Territory, Australia.