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

Mark Hamblin / 2020VISION / Silver birch (Betula pendula) woodland with Juniper (Juniperus communis) in winter, Rothiemurchus Forest, Cairngorms NP, Scotland, UK, November 2011

Diane McAllister / Northern saw-whet owl (Aegolius acadicus) roosting in a juniper tree in a backyard in Reno. Nevada, USA, December

Diane McAllister / Anna's hummingbird (Calypte anna) chicks about to fledge, in their nest in juniper tree in southwest Reno. Nevada, USA, July

Shattil & Rozinski / Rocky Mountain juniper tree (Juniperus scopulorum) in 'krummholz' formation, shaped by the environment at altitude, on edge of the treeline, Wyoming, USA, North America

Shattil & Rozinski / Rocky Mountain juniper tree (Juniperus scopulorum) in 'krummholz' formation, shaped by the environment at altitude, on edge of the treeline, Wyoming, USA, North America

Oriol Alamany / Old Phoenician Juniper tree (Juniperus phoenicea) in Dana Nature Reserve, Jordan, April 2009

Jean E. Roche / Close up of peeling bark of Juniper tree {Juniperus thurifera} Theus, Alps, France

Jean E. Roche / Close up of peeling bark of Juniper tree {Juniperus thurifera} Theus, Alps, France

David Welling / Western juniper tree {Juniperus occidentalis} ancient tree, Yosemite NP, California, USA

Nigel Bean / Pinyon jay {Gymnorhinus cyanocephala} perched on Juniper tree, Arizona, USA. vulnerable species

Jeff Vanuga / A lone Raven roosts in an ancient Juniper tree silhouetted by the setting sun, Dubois Badlands, Dubois, Wyoming, USA

Jose B. Ruiz / Close up of peeling bark of the Phoenician juniper tree (Juniperus phoenicea) Valladolid, Spain

Michael Durham / Western Juniper (Juniperus occidentalis) tree at night in the Ochoco National Forest, Oregon

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

Michael Durham / Deer Mouse (Peromyscus maniculatus) under a juniper tree at night, John Day Fossil Beds National Monument, Clarno Unit, Oregon

Rolf Nussbaumer / Male Golden-cheeked Warbler (Dendroica chrysoparia) on Juniper tree, San Antonio, Texas, USA. April 2003

Michael Durham / Silver-haired Bat (Lasionycteris noctivagans) roosting in Juniper tree near Drake Creek in Lake County, Oregon

Michael Durham / Silver-haired Bat (Lasionycteris noctivagans) roosting in Juniper tree near Drake Creek in Lake County, Oregon

Rolf Nussbaumer / White breasted nuthatch {Sitta carolinensis} adult on Juniper tree, Chiricahua Mountains, Arizona, USA

Rolf Nussbaumer / Western bluebird {Siala mexicana} female on Juniper tree, Colorado, USA

Rolf Nussbaumer / American robin {Turdus migratorius} Male eating juniper tree berries, Yellowstone NP, Wyoming, USA

Rolf Nussbaumer / Townsend's solitaire {Myadestes townsendi} adult on juniper tree, Yellowstone NP, Wyoming, USA

Rolf Nussbaumer / American robin {Turdus migratorius} Male eating juniper tree berries, Yellowstone NP, Wyoming, USA

David Noton / Juniper tree growing in Balanced Rock Arches National Park, Utah, USA, North America

Sebastian Kennerknecht / Western Juniper (Juniperus occidentalis) on granite summit at sunrise, Emigrant Wilderness, Stanislaus National Forest, Sierra Nevada, California

Robert Thompson / Juniper carpet moth (Thera juniperata juniperata) on tree bark, UK