Floris van Breugel / Monarch butterflies (Danaus plexippus) over winter on Eucalyptus and Monterey Cypress trees near Pismo Beach, San Luis, California, USA December.. When temperatures warm up enough, they will embark on...

Olga Kamenskaya / View of people standing on ice from underneath car, on the ice of Lake Baikal, Siberia, Russia, March. Property released and Model released.

Olga Kamenskaya / Mini van crossing Lake Baikal ice, Siberia, Russia, March.

Olga Kamenskaya / Car on thick Lake Baikal ice, Lake Baikal, Siberia, Russia, March. Property released.

Peter Cairns / American bison (Bison bison) walking through snow using tracks made by other animals, Yellowstone National Park, Wyoming, USA, February.

Peter Cairns / American Bison (Bison bison) walking through deep snow, Yellowstone National Park, Wyoming, USA, February.

Adrian Davies / Trail left in a Bramble leaf by the larvae of a Pygmy eyecap moth (Stigmella aurella), scanned on a flatbed scanner, Surrey, England, UK.

Markus Varesvuo / Common shag (Phalacrocorax aristotelis) flying, with the sun in the background, Vardo, Norway, March.

Alex Mustard / Blue shark (Prionace glauca) near the surface of the English Channel. Penzance, Cornwall, England, British Isles. North East Atlantic Ocean, August. Digitally manipulated to improve composition see 1...

Theo Bosboom / Reindeer (Rangifer tarandus) male walking across beach in winter, near Hofn, Iceland, February

Orsolya Haarberg / Chamois (Rupicapra rupicapra) walking, casting shadow on the snow, Alps, Gran Paradiso National Park, Italy. November 2008

Graham Eaton / Leatherback Turtle Hatchling (Dermochelys coriacea) crossing a beach towards the sea at sunrise, Cayenne, French Guiana, July