Visuals Unlimited / Agile Gibbon (Hylobates agilis) face portrait, Tanjung Puting National Park, Kalimantan, Borneo, Indonesia

Visuals Unlimited / Black-eyed Susans refracted in dew drops on blade of grass

Visuals Unlimited / Milk Frog (Trachycephalus resinifictrix) looking at its reflection in water, captive

Visuals Unlimited / Margay (Leopardus wiedii) up in tree, Costa Rica.

Visuals Unlimited / Strawberry Poison Arrow Frog (Oophaga pumilio) rear view climbing up plant, Costa Rica. These frogs have neurotoxins that are exuded through the skin. The bright colours are a warning to potential pre...

Visuals Unlimited / Emerald Glass Frog (Centrolenella prosoblepon), sitting within leaf tunnel, Costa Rica.

Visuals Unlimited / Grizzly Bear (Ursus arctos horribilis) roaring head profile, Montana, USA. Captive.

Visuals Unlimited / Bioluminescent deep-sea Ophiuroid Brittle Star (Ophiochiton ternispinus)

Visuals Unlimited / Deep-Sea Jellyfish (Crossota)

Visuals Unlimited / Deep-sea Hermit Crab outside a shell (Pagurus curacaoensis)

Visuals Unlimited / Mosquito (Culex pipiens) female feeding on human blood, while a second mosquito is arriving.

Visuals Unlimited / Spider on its web (Neogea nocticolor)

Visuals Unlimited / Eastern / Red Milkweed longhorn Beetle (Tetraopes tetraophthalmus) head portrait, USA

Visuals Unlimited / Mosquito (Culex pipiens) backlit while drinking blood.

Visuals Unlimited / Barred Owl (Strix varia) hunting for prey, Ontario, Canada.

Visuals Unlimited / Rainbow Starfrontlet (Coeligena iris) hovering portrait, Utuana Reserve, Ecuador.

Visuals Unlimited / Magnolia Warbler (Setophaga / Dendroica magnolia) male singing on a spruce branch, Ontario Canada.

Visuals Unlimited / Harlequin Duck (Histrionicus histrionicus) perched on a rock near crashing surf, Victoria, British Columbia, Canada.

Visuals Unlimited / Booted Racket tail Hummingbird (Ocreatus underwoodii) male flying, Tandayapa Valley, Ecuador.

Visuals Unlimited / Crowned WoodNymph (Thalurania colombica) hovering near flower, Costa Rica

Visuals Unlimited / Gecko (Haemodracon riebeckii) on a young Desert Rose (Adenium obesum) tree. Both endemic of Socotra, Yemen.

Visuals Unlimited / Shining Honeycreeper (Cyanerpes lucidus) Costa Rica

Visuals Unlimited / Brown Bear (Ursus arctos) standing, running, jumping

Visuals Unlimited / Close up of proboscis of Fruit fly (Drosophila sp) SEM X350

Visuals Unlimited / Negative stain electron micrograph of the Swine Influenza Virus. TEM X29,800

Visuals Unlimited / Treefrog (Osteocephalus buckleyi) perched sitting in a cup mushroom, Tambopata Candamo Reserve, Peru

Visuals Unlimited / Sweat Bee (Halictus sp) on a composite flower coated with pollen, New Hampshire, USA

Visuals Unlimited / An AlgaeLink Algae growing system being used to make ethanol and biodiesel. A benefit from producing oil from algae in this way rather from plant oil crops like oil seed rape is that it does not take...

Visuals Unlimited / Dr. Ian Bartholomew taking measurements as part of a study to measure the speed of the receding Russell Glacier near Kangerlussuag, Greenland. The study is looking at how melt water is affecting the g...

Visuals Unlimited / Dr. Ian Bartholomew using equipment to study melt water as part of a study to measure the speed of the receding Russell Glacier near Kangerlussuag, Greenland. July 2008

Visuals Unlimited / Brown Pelican (Pelecanus occidentalis) diving, Florida, USA, digital composite

Visuals Unlimited / Southern bluefin tuna (Thunnus maccoyii) circle in a holding pen, off Port Lincoln, Australia.

Visuals Unlimited / A Violet Snail (Janthina janthina) floats on a raft of bubbles while it feeds on a Portuguese Man-of-War (Physalia physalis), Hawaii, USA.

Visuals Unlimited / M81 Spiral Galaxy in Ursa Major

Visuals Unlimited / The Horsehead Nebula region (Barnard33)

Visuals Unlimited / Grass pollen. SEM X3800 at 4 x 4

Visuals Unlimited / Tarpons (Megalops atlanticus) grow up to 2 m (6.6 ft) in length and could weigh 160 kg (350 lb), Islamorada, Florida Keys National Marine Sanctuary, USA, Atlantic Ocean.

Visuals Unlimited / H1N1 Influenza Virus or Swine Flu Virus. A member of the taxonomic family Orthomyxoviridae, the influenza virus is a single-stranded RNA organism.

Visuals Unlimited / H1N1 Influenza Virus or Swine Flu Virus. A member of the taxonomic family Orthomyxoviridae, the influenza virus is a single-stranded RNA organism.

Visuals Unlimited / Triangle / Clown Tree Frog (Hyla triangulum), Iquitos, Peru

Visuals Unlimited / Rough-toothed Dolphin (Steno bredanensis) analyzing the photographer by using impulse-type (click-type) sonar for precise echolocation and imaging, Kona Coast, Big Island, Hawaii, Pacific Ocean.

Visuals Unlimited / Traditional Chinese fisherman with Cormorants on the Li River at sunrise, near Guilin, China

Visuals Unlimited / Traditional Chinese fisherman with Cormorants and karst formations in the background along Li River at twilight, near Guilin, China

Visuals Unlimited / Traditional fisherman with his Cormorants on the Li River at twilight, Guilin, China

Visuals Unlimited / Aerial view of flower field patterns surrounding Amsterdam, Holland, February 2010

Visuals Unlimited / Close up of a Fruit Fly (Drosphila) compound eye. SEM X2500

Visuals Unlimited / 3D MRI scan of a Dolphin

Visuals Unlimited / Whooping Crane (Grus americana).