SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) in Scots pine forest, Cairngorms National Park, Highlands, Scotland, UK, April.

SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) in Scots pine forest, Cairngorms National Park, Highlands, Scotland, UK, April.

SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) in Scots pine forest, Cairngorms National Park, Highlands, Scotland, UK, April.

SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) in Scots pine forest, Cairngorms National Park, Highlands, Scotland, UK

SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) climbing down Scots pine tree, just tail visible. Cairngorms National Park, Highlands, Scotland. August.

SCOTLAND: The Big Picture / Red squirrel (Sciurus vulgaris) in summer coat on Scots pine tree trunk, Highlands, Scotland

SCOTLAND: The Big Picture / Scots pine (Pinus sylvestris) with Northern lights / Aurora borealis lighting up the night sky in background, Monadhliath Mountains, Cairngorms National Park, Scotland, UK, October 2015.

Niall Benvie / Scots pines (Pinus sylvestris) Torridon, Scotland, UK, November.

Andy Trowbridge / Capercaillie (Tetrao urogallus) male displaying in Scots pine tree (Pinus sylvestris) Southern Norway. May.

Erlend Haarberg / Siberian jay (Perisoreus infaustus) in Scots pine forest, near fallen tree, Stora Sjofallet National Park, Laponia World Heritage Site, Lapland, Sweden, October.

Sandra Bartocha / Scots pine (Pinus sylvestris) trees in snowy woodland in evening sunlight, Potsdam, Germany, January.

Sandra Bartocha / Silver birch (Betula pendula) and Scots pine (Pinus sylvestris) trunks in snow, Muritz-National Park, Germany, January.