John Shaw / Hybrid Poplar tree plantation in autumn (Populs sp.). Boardman Tree Farm, near Irrigon, Oregon, USA. October.

Pascal Tordeux / Walnut (Juglans regia) in field of ripe barley before a storm, Ribemont, Picardy, France.

Alex Mustard / Planktonic sea walnut ctenophore (Mnemiopsis mccradyi) in open water, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Pascal Tordeux / Walnut (Juglans) tree in snow and mist. Picardie, France, November.

Pascal Tordeux / Lone Walnut (Juglans) tree in a field of barley. Picardy, France.

Florian Möllers / Red squirrel (Sciurus vulgaris) reaching up to take walnut from hand, Berlin, Germany, November. Model released

Nigel Cattlin / Walnut (Juglans regia), developing leaves , necrotic with frost damage. Berkshire, England, UK. May.

Suzi Eszterhas / North American beaver (Castor canadensis), orphaned kit swimming in sink. Lindsay Wildlife Experience, Walnut Creek, Contra Costa County, California, USA. September 2015. Captive. Digitally enhanced.

Suzi Eszterhas / North American beaver (Castor canadensis) orphaned kit feeding from syringe. Lindsay Wildlife Experience, Walnut Creek, Contra Costa County, California, USA. September 2015. Captive.

Nick Upton / Walnut orb-weaver spider (Nuctenea umbratica) female, near a retreat under the eaves of a garden shed, near Wells, Somerset, UK, September.

Nick Upton / Walnut orb-weaver spider (Nuctenea umbratica) female spinning its web at night between the legs of a garden table, near Wells, Somerset, UK, September.

Nick Upton / Walnut orb-weaver spider (Nuctenea umbratica) female, on its web on a garden fence at night, Wiltshire, UK, October.