Danny Green / Hazel Dormouse (Muscardinus avellanarius) hibernating amongst leaves and acorns. Captive. Leicestershire, UK, October.

Marie Read / Blue jay (Cyanocitta cristata) holding an acorn in its bill whilst perched on tree stump, with autumn foliage, New York, USA, October.

Ingo Arndt / Bower of Vogelkop bowerbird (Amblyornis inornatus) front entrance of bower decorated with red fruit and acorns, Arfak Mountains, West Papua, Indonesia.

Glenn Bartley/ BIA / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Alan Murphy / Acorn Woodpecker (Melanerpes formicivorus), Arizona

Markus Varesvuo / Siberian Jay (Perisoreus infaustus) flying over snow covered ground, carrying acorn in beak, Kuusamo Finland, Scandinavia, March. Magic Moments book plate.

Markus Varesvuo / Siberian Jay (Perisoreus infaustus) flying over snow covered ground, carrying acorn in beak, Kuusamo Finland, Scandinavia, March.

Glenn Bartley / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Ross Hoddinott / 2020VISION / English oak tree {Quercus robur} acorn sprouting a fresh shoot, Beacon Hill Country Park, The National Forest, Leicestershire, UK, November. Did you know? In Norse legend the Oak tree was sacred to T...

Ross Hoddinott / 2020VISION / English oak tree {Quercus robur} acorn and fallen leaves in autumn, Beacon Hill Country Park, The National Forest, Leicestershire, UK, November

Kim Taylor / Jumping Spider (Marpissa mucosa) female leaping from acorn to acorn, using silk as a safety line. Surrey, UK, September.

Russell Cooper / Acorn Weevil (Curculio glandium) resting on English Bluebell (Endymion nonscriptus) flower stem in springtime, Banstead Woods Site of Special Scientific Interest (SSSI), Ancient Woodland, North Downs,...