Nick Garbutt / Aggregation / bloom / swarm of Moon Jellyfish (Aurelia aurita) in the clear waters of Loch Na Keal, off the Isle of Mull, north west Scotland, UK, June, Photographed through the surface.

Doug Perrine / Bioluminescence from glowing plankton in sea tide line on beach, with stars above and ship lights on horizon, Vaadhoo Island, Raa Atoll, Maldives, Indian Ocean, October 2010

Shane Gross / Pelagic thresher shark (Alopias pelagicus) cleaned by a Bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

Shane Gross / Pelagic thresher shark (Alopias pelagicus) being cleaned by a bluestreak cleaner wrasse (Labroides dimidiatus) at Monad Shoal off Malapascua Island, Philippines.

David Fleetham / Cleaner wrasse (Labroides dimidiatus) eating parasites off Coral grouper (Cephalopholis miniata) with Shrimp (Lysmata amboinensis) Mabul Island, Malaysia.

Edwin Giesbers / RF - Banded darter (Sympetrum pedemontanum) group of five resting, Netherlands, September. (This image may be licensed either as rights managed or royalty free.)

Adam Burton / Bluebells and beech trees in West Woods, Wiltshire, England, UK. May 2013.

Phil Savoie / Radnor lily (Gagea bohemica) the rarest flower in the UK at sunset, Stanner Rocks National Nature Reserve, Powys, Wales, UK, February. Commended in the BWPA (British Wildlife Photography Awards) Compe...

Chris & Monique Fallows / Impala (Aepyceros melampus) herd at dawn, Mana Pools National Park, Zimbabwe, October.

Sandra Bartocha / European beech tree (Fagus sylvatica). in woodland, Serrahn, Muritz-National Park, World Natural Heritage site, Germany, Europe. October 2015.

Sandra Bartocha / Sun rays shining through European beech woodland (Fagus sylvatica). Serrahn, Muritz-National Park, World Natural Heritage site, Germany, Europe. November 2015.

Andy Rouse / Iceberg and mountain, Svalbard, Norway. Arctic. July.

Andy Rouse / Great crested grebe (Podiceps cristatus) swimming, backlit with morning light forming a bokeh affect on the water, Wales, UK, February. Highly commended in the Habitat Category of the BWPA (British W...

Matthew Maran / Landscape of London at dawn with fog from Hampstead Heath, London, England, UK. November 2014.

Wim van den Heever / Lioness (Panthera leo) sitting during misty sunrise, Okavango Delta, Botswana.

Wim van den Heever / Tranquil landscape with African elephant (Loxodonta africana) and rays of sunlight at sunrise, Masai Mara, Kenya.

Andres M. Dominguez / Frozen Elmleaf blackberry (Rubus ulmifolius) in a small pond, Sierra de Grazalema Natural Park, southern Spain, January.

Andres M. Dominguez / Mirror orchid (Ophrys speculum) in the Sierra de Grazalema Natural Park, El Bosque, southern Spain, April.

Wim van den Heever / Quiver tree (Aloe dichotoma) with the Milky Way at night, and light pollution from town in the distance, Keetmanshoop, Namibia. Colours accentuated digitally.

Wim van den Heever / Quiver tree (Aloe dichotoma) with the Milky Way at night, and light pollution from town in the distance, Keetmanshoop, Namibia. Colours accentuated digitally.

Wim van den Heever / Quiver tree (Aloe dichotoma) with the Milky Way at night, and light pollution from town in the distance, Keetmanshoop, Namibia. Colours accentuated digitally.

Wim van den Heever / Quiver trees (Aloe dichotoma) with the Milky Way at night, Keetmanshoop, Namibia. Colours accentuated digitally.

Wim van den Heever / Quiver trees (Aloe dichotoma) with the Milky Way at night, Keetmanshoop, Namibia.

Wim van den Heever / Quiver trees (Aloe dichotoma) with the Milky Way at night, Keetmanshoop, Namibia.

Erlend Haarberg / Photographer silhouetted on Mt Luottotjakka overlooking the Arjep Luottojekna and Nuortap glaciers at sunset, Sarek National Park, World Heritage Laponia, Swedish Lapland, Sweden, August 2013.

Claudio Contreras / Aerial view of Red mangrove (Rhizophora mangle) coastal lagoon, Sian Ka'an Biosphere Reserve, Caribbean Sea, Mexico, January

Alex Hyde / Sheetweb weaving spider (Linyphiidae) in web at sunset. The silk is refracting the light into a rainbow of coloured bands. Slovenia, July.

Wim van den Heever / Gemsbok (Oryx gazella) viewed from above, Namib Desert, Namibia.

Wim van den Heever / Quiver tree forest (Aloe dichotoma) at night with stars and the milky way, Keetmanshoop, Namibia.

Wim van den Heever / Quiver tree forest (Aloe dichotoma) at night with stars and the Milky Way, Keetmanshoop, Namibia.

Alex Mustard / Harlequin sweetlips (Plectorhinchus chaetodonoides) cleaned by a pair of bluestreak cleaner wrasse (Labroides dimidiatus). South Atoll, Tubbataha Atolls, Tubbataha Reefs Natural Park, Palawan, Philipp...

Sven Zacek / Hepatica (Hepatica nobilis) white morph and normal blue morph, Southern Estonia, April.

Fabrice Cahez / Morning mist over the countryside, Aubrac, France, July 2015.

Nick Garbutt / Madagascar sunset moth (Chrysiridia rhipheus) resting on tree. Masoala Peninsula, north east Madagascar. Controlled conditions.

Constantinos Petrinos / Peacock Anemone (Anemone pavomina) with dew. Pink flower. Mount Hymettus, Kessariani Aesthetic Forest, East-Central Attica, Greece, March.

Sven Zacek / Misty lake, with trees reflected in the water, and Willow (Salix) trees silhouetted on the shore, Suur Emajogi river, Tartumaa, Estonia, May 2014.

Sven Zacek / Cross-country skiier on a moonlit night admiring the Northern Lights (Aurora borealis), Norway, March 2013.

Pascal Pittorino / Ground beetle (Carabus hispanus) resting on a leaf of Hydrangea (Hydrangea sp), Lozere, Cevennes, Languedoc Roussillon, France, July.

Richard Du Toit / Longtailed widowbird (Eupletes progne) male perched in flowers, Rietvlei Nature Reserve, South Africa.

Juan Carlos Munoz / European beech forest (Fagus sylvatica) in autumn, view from below in the mist, Ilirska Bistrica, Green Karst, Slovenia, October.

Solvin Zankl / By-the-wind sailor (Velella velella) colony. Sargasso Sea, Bermuda.

Solvin Zankl / Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda

Ross Hoddinott / Ice on black volcanic sand beach with waves, Jokulsarlon, Southeast Iceland, February.

Konrad Wothe / View up into canopy with sun rays shining through the leaves, lowland rainforest, Panguana Reserve, Huanuco province, Amazon basin, Peru.

Danny Green / Japanese cranes (Grus japonensis) displaying in snow, Hokkaido, Japan, February

Alex Hyde / Chlorophyte or green alga (Volvox aureus) in pond water. UK. The larger spheres are approximately 0.5mm in diameter. Digital composite image.

Ole Jorgen Liodden / Heartsease / Wild pansy (Viola tricolor) flower, Norway, May.

Ole Jorgen Liodden / Chatham stream on the main Chatham island, New Zealand, March 2014.