Markus Varesvuo / Willow grouse (Lagopus lagopus) extremely well camouflaged below snow laden tree, Inari Kiilopaa Finland January

Markus Varesvuo / Willow grouse (Lagopus lagopus) extremely well camouflaged below snow laden tree, Inari Kiilopaa Finland January

Markus Varesvuo / Willow grouse (Lagopus lagopus) perched on top of snow laden tree, Inari Kiilopaa Finland January

Markus Varesvuo / Willow grouse (Lagopus lagopus) extremely well camouflaged below snow laden tree, Inari Kiilopaa Finland January Highly commended in the Bird category of the Asferico Photography Competition 2017.

Andres M. Dominguez / Bacteria (Leptothryx discophora) causing iridescent sheen on water surface with White willow leaf (Salix alba). Sierra de Grazalema Natural Park, southern Spain, November.

Andres M. Dominguez / Bacteria (Leptothryx discophora) causing iridescent sheen on water surface with White willow leaf (Salix alba). Sierra de Grazalema Natural Park, southern Spain, November.

Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) sitting next to snow covered tree, Inari Kiilopaa, Finland, February.

Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) standing at foot of tree, Utsjoki, Finland, April.

MYN / Niall Benvie / Crack willow (Salix fragilis) catkins, Angus, Scotland, UK, May.

Fabrice Cahez / White willow (Salix alba) catkin, Vosges, France, April.

Nick Upton / Eurasian beaver (Castor fiber) kit feeding on Willow (Salix) leaves at night, born in the wild on the River Otter, part of a release project managed by the Devon Wildlife Trust, Devon, England, UK, Au...

Markus Varesvuo / Willow grouse (Lagopus lagopus) in tree, Kiilopaa, Inari, Finland, January.