Sergey Gorshkov / Muskox (Ovibos moschatus) pair, Wrangel Island, Russia

Erlend Haarberg / Muskox (Ovibos moschatus) shaking off snow after snowstorm, Dovrefjell-Sunndalsfjella National Park, Norway, March

Erlend Haarberg / Muskoxen (Ovibos moschatus) head portrait, Dovrefjell-Sunndalsfjella National Park, Sor-Trondelag, Norway, December

Erlend Haarberg / Muskox (Ovibos moschatus) footprints left in snow, Dovrefjell-Sunndalsfjella National Park, Norway, December 2007

Erlend Haarberg / Muskox (Ovibos moschatus) portrait, Dovrefjell-Sunndalsfjella National Park, Sor-Trondelag, Norway, December

Dave Watts / Musk lorikeet (Glossopsitta concinna) amongst flowers in a Eucalyptus tree, south-east Tasmania, Australia, February

Radomir Jakubowski / Muskox (Ovibos moschatus) closeup resting, Dovrefjell national park, Norway, September

Radomir Jakubowski / Muskoxen (Ovibos moschatus) mother protecting young, approached by male, Dovrefjell national park, Norway, September

Radomir Jakubowski / Two Muskox (Ovibos moschatus) in landscape, Dovrefjell national park, Norway, September

Radomir Jakubowski / Muskox (Ovibos moschatus) running in landscape, Dovrefjell national park, Norway, September

Juan Carlos Munoz / Muskox (Ovibos moschatus) on the tundra in autumn, Dovrefjell NP, Norway, September 2008

Juan Carlos Munoz / Muskox (Ovibos moschatus) on the tundra in autumn, Dovrefjell NP, Norway, September 2008