Tim Fitzharris / Western Juniper (Juniperus occidentalis) and Jeffrey Pine (Pinus jeffreyi) trees, Phipps Peak, Eldorado National Forest, California

Markus Varesvuo / Goldcrest (Regulus regulus) perched amongst juniper berries, Espoo, Finland, February

Floris van Breugel / Juniper Tree (Juniperus thurifera) at night, silhouetted next to standing rock, Joshua Tree National Park. California, USA, January 2009

David Kjaer / Male American robin (Turdus migratorius) puffed up to keep warm, and perched on Juniper branch, Kentucky, USA

Jack Dykinga / Pinyon pine (Pinus edulis) and Utah juniper (Juniperus osteosperma) on kaibab limestone spires in morning fog, North Rim, North Kalbab Trail, Grand Canyon National Park, Arizona, USA

Jose B. Ruiz / Close up of flaking bark of Phoenician juniper tree (Juniperus phoenicea) Spain

Nick Upton / Prickly juniper (Juniperus oxycedrus) bush, berries ripening. In garrigue / maquis scrubland, Supramonte mountain range, near Urzulei, Sardinia, Italy. June 2018.

Nick Upton / Prickly juniper (Juniperus oxycedrus) bush, berries ripening. In garrigue / maquis scrubland, Supramonte mountain range, near Urzulei, Sardinia, Italy. June 2018.

Juan Carlos Munoz / Spanish juniper (Juniperus thurifera), Sabinar de Hornuez, Castille and Leon, Spain. October.

Jeff Foott / Western Juniper (Juniperus occidentalis) tree winter and Delicate Arch, Arches National Park, Utah

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Jeff Foott / Western Juniper (Juniperus occidentalis) and sandstone formation, Balanced Rock, Arches National Park, Utah