Marie Read / Common redpoll (Carduelis flammea), male perched in alder (Alnus rugosa) during a snowstorm in winter, New York, USA, January.

Sven Zacek / Ural owl (Strix uralensis) perched on Alder (Alnus sp) tree at dusk. Tartumaa, Southern Estonia. April.

Kim Taylor / Redpoll (Carduelis flammea) male landing on Alder (Alnus glutinosa) Surrey, England. February

Floris van Breugel / Emerging spring leaves adorn the mossy trees - Vine Maple (Acer circinatum) and Alder (Alnus rubra) in Mt Baker - Snoqualmie National Forest. Washington. April 2013

Mark Hamblin / 2020VISION / Alder trees (Alnus hirsuta) silhouetted and reflected in River Spey in winter, Cairngorms NP, Scotland, UK, December 2010

Peter Cairns / Flooded birch and alder woodland in autumn, Cairngorms National Park, Scotland, UK, November, RUNNER UP: In Praise of Plants category of the Wildlife Photographer of the Year Competition 2010

Wild Wonders of Europe / Cairns / Great grey owl (Strix nebulosa) backlit in alder tree, Bergslagen, Sweden, June 2009

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} male grooming female in courtship in Japanese green alder tree {Alnus firma}, autumn, Jigokudani, Nagano, Japan

Ross Hoddinott / Common alder (Alnus glutinosa) catkins silhouetted. Cornwall. UK

Benjam Pontinen / Siberian flying squirrel feeds in alder tree. Nurmo, Finland.

Bernard Castelein / Alder buckthorn (Frangula alnus) tree at dawn. Klein Schietveld, Brasschaat, Belgium. April.

Bernard Castelein / Alder buckthorn (Frangula alnus) in grassland at sunrise. Klein Schietveld, Brasschaat, Belgium. August 2019.