David Pattyn / Alpine ibex (Capra ibex) struggling in deep snow on a steep slope, Valsavarenche, Gran Paradiso National Park, Aosta Valley, Italy, January

John Chan / Elegant tern (Thalasseus elegans) with a broken wing, attempting to take off, Southern California, USA, April.

John Waters / Slow motion clip of a Brown trout (Salmo trutta) predating an adult Mayfly (Ephemoptera) struggling to take off from water, River Kennet, Hungerford, Berkshire, England, UK, June.

Dave Bevan / Eastern grey squirrel (Sciurus, Carolinensis) entering top of a bird feeder, struggling to get out again, Carmarthenshire, Wales, UK, June.

Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chicks calling, with another small chick arriving and falling over, Adelie Land, Antarctica, January.

Peter Bassett / King penguins (Aptenodytes patagonicus) wading through mud and falling over, Prion Island, South Georgia.

Nick Upton / Little egret (Egretta garzetta) struggling to swallow a large Pike (Esox lucius) it has just caught, Rutland Water, Rutland, England, UK, November.

Andy Rouse / Giant panda (Ailuropoda melanoleuca) cub aged five months stuck after climbing a tree in a breeding centre, Chengdu, China. Captive.

Sergey Gorshkov / Lionesses (Panthera leo) trying to bring down African buffalo (Syncerus caffer) Londolozi Private Game Reserve, Sabi Sands Game Reserve, South Africa. Sequence 1 of 5

Sergey Gorshkov / Lionesses (Panthera leo) trying to bring down African buffalo (Syncerus caffer) Londolozi Private Game Reserve, Sabi Sands Game Reserve, South Africa. Sequence 2 of 5

Sergey Gorshkov / Lionesses (Panthera leo) trying to bring down African buffalo (Syncerus caffer) Londolozi Private Game Reserve, Sabi Sands Game Reserve, South Africa. Sequence 3 of 5

Sergey Gorshkov / Lioness (Panthera leo) trying to bring down African buffalo (Syncerus caffer) Londolozi Private Game Reserve, Sabi Sands Game Reserve, South Africa. Sequence 4 of 5