Ingo Arndt / Flock of Bramblings (Fringilla montifringilla) in flight, an estimated four million return to roost overwinter in Black Forest, Germany, March.

Ingo Arndt / Aerial view of the coniferous foest with Oyamel fir trees where Monarch butterflies (Danaus plexippus) overwinter, central highlands, Michoacan, Mexico

Ingo Arndt / Aerial view of the coniferous forests, with Oyamel fir trees where Monarch butterflies (Danaus plexippus) overwinter, central highlands, Michoacan, Mexico

Ingo Arndt / Oyamel fir trees (Abies religiosa) growing in pots in nursery for a reforestation programme to replant after illegal logging has destroyed areas of mountain forests where Monarch butterflies (Danaus p...

Ann & Steve Toon / Barnacle geese (Branta leucopsis) in stubble field, Islay, Scotland, UK, October

Ann & Steve Toon / Barnacle geese (Branta leucopsis) and White fronted geese (Anser albifrons), in stubble field, Islay, Scotland, UK, October

Ann & Steve Toon / White fronted geese (Anser albifrons) in stubble field, Islay, Scotland, UK, October

Floris van Breugel / Hibernating Ladybirds (Hippodamia convergens) assembled en masse to overwinter, King's Canyon National Park, California, USA, May 2009

Jorma Luhta / Whooper swan {Cygnus cygnus} tries to overwinter in the arctic, February, Finland 2007

Nature Production / Chinese mystery snail {Cipangopaludina chinensis malleata} snails preparing to overwinter in mud, Wakayama, Japan, October

Phil Chapman / Bristle Thighed Curlew. (Numenius tahitiensis) Herson Migrates 6000 kilometers across

Phil Chapman / Bristle Thighed Curlew. (Numenius tahitiensis) Herson Migrates 6000 kilometers across

Nigel Cattlin / Early blisters of Pear leaf blister mite (Eriophyes pyri) red on young pear foliage and flower peduncles in spring, Berkshire, April

Nigel Cattlin / Early blisters of Pear leaf blister mite (Eriophyes pyri) red on young pear foliage and flower peduncles in spring, Berkshire, April