Dave Bevan / Eastern grey squirrel (Sciurus, Carolinensis) entering top of a bird feeder, struggling to get out again, Carmarthenshire, Wales, UK, June.

David Tipling / Red Squirrel {Sciurus vulgaris} and Coal Tit {Parus ater} on garden nut feeder, UK.

Georgette Douwma / Grey squirrel {Sciurus carolinensis} taking nuts from bird feeder, Regents Park, London, UK

Mike Read / Grey squirrel on squirrel proof bird feeder {Sciurus carolinensis} UK

Roger Powell / Grey squirrel (Sciurus aureogaster) trying to steal peanuts from a garden bird feeder. Bessacarr, Doncaster, Yorkshire, England, UK, December.

Roger Powell / Grey squirrel (Sciurus aureogaster) trying to steal peanuts from a garden bird feeder. Bessacarr, Doncaster, Yorkshire, England, UK, December.

David Woodfall / Red squirrel (Sciurus vulgaris) adult at feeder. Henllys, Anglesey, Wales, UK, April.

Dave Watts / Red squirrel (Sciurus vulgaris) at nut feeder, French Pyrenees, France

Dave Bevan / Eastern gray squirrel (Sciurus carolinensis) eating peanuts from a bird table, Carmarthenshire, Wales, UK, February.

Dave Bevan / Eastern gray squirrel (Sciurus carolinensis) eating peanuts from a bird table, Carmarthenshire, Wales, UK, February.

Dave Bevan / Grey squirrel (Sciurus carolinensis) jumping from a branch to a peanut feeder and back again, disturbing a group of feeding tits, Carmarthenshire, Wales, UK, January.

Dave Bevan / Grey squirrel (Sciurus carolinensis) jumping from a branch to a peanut feeder and back again, Carmarthenshire, Wales, UK, January.

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding from a dislodged peanut feeder, Carmarthenshire, Wales, UK, December.

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding from a dislodged peanut feeder, Carmarthenshire, Wales, UK, December.

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding from a peanut feeder in the rain, Carmarthenshire, Wales, UK, December.

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding from a peanut feeder in the rain, Carmarthenshire, Wales, UK, December.

Dave Bevan / Grey squirrel (Sciurus carolinensis) hanging upside down whilst eating from a string of unshelled peanuts, Carmarthenshire, Wales, UK, November.

Dave Bevan / Grey squirrel (Sciurus carolinensis) hanging upside down whilst eating from a string of unshelled peanuts, Carmarthenshire, Wales, UK, November.

Dave Bevan / Grey squirrel (Sciurus carolinensis) trying to remove a string of peanuts from a bird table, Carmarthenshire, Wales, UK, November.

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding on unshelled stringed peanuts from a bird table, Carmarthenshire, Wales, UK, November.

Georgette Douwma / Grey squirrel (Sciurus carolinensis) and Rose-ringed / Ring-necked parakeets (Psittacula krameri) on bird feeders. London, UK.

Bernard Castelein / Red Squirrel (Sciurus vulgaris) feeding from squirrel feeder, Brasschaat, Belgium, February.

Bernard Castelein / Red Squirrel (Sciurus vulgaris) feeding from squirrel feeder, Brasschaat, Belgium, February.

Matthew Maran / Red squirrel (Sciurus vulgaris) at bird feeder, Scotland, UK

Mark Hamblin / 2020VISION / Red squirrel (Sciurus vulgaris) feeding on peanuts in feeder, Scotland, UK, November

Philippe Clement / Red Squirrel (Sciurus vulgaris) in forest eating peanuts from bird feeder, Scotland, UK

Philippe Clement / Red Squirrel (Sciurus vulgaris) in forest eating peanuts from bird feeder, Scotland, UK

Laurent Geslin / Red squirrel (Sciurus vulgaris) on feeder, in urban park, Paris, France.

David Woodfall / Red squirrel (Sciurus vulgaris) trying to feed on nuts from bird feeder, UK

Peter Cairns / Red squirrel (Sciurus vulgaris) in pine forest attempting to feed from bird feeder, Cairngorms NP, Highland, Scotland, UK, February

Stephen Dalton / Grey squirrel {Sciurus carolinensis} on hanging garden bird feeder, UK

Dave Bevan / Grey squirrel (Sciurus carolinensis) feeding from bird seed feeder, Norfolk, UK, February

Roger Powell / Red Squirrel (Sciurus vulgaris) hanging on peanut feeder for birds, Northumberland, UK

MORLEY READ / Grey squirrel {Sciurus carolinensis} on 'squirrel proof' bird feeder, Hampshire, UK

Brian Lightfoot / Red squirrel {Sciurus vulgaris} on bird peanut feeder, Aviemore, Scotland, UK

GEORGETTE DOUWMA / Grey squirrel {Sciurus carolinensis} feeding from bird feeder, UK.

GEORGETTE DOUWMA / Grey squirrel {Sciurus carolinensis} feeding from bird feeder, UK.

GEORGETTE DOUWMA / Grey squirrel {Sciurus carolinensis} feeding from bird feeder, UK.

Hanne & Jens Eriksen / Red squirrel {Sciurus vulgaris} feeding on bird fat feeder in pine tree, Denmark

Ross Hoddinott / Female grey squirrel (Sciurus carolinensis) eating peanuts from a bird feeder. Cornwall, UK.

GEORGETTE DOUWMA / Grey squirrel feeding from bird feeder {Sciurus carolinensis} England

Colin Seddon / Grey squirrel hanging from bird feeder {Sciurus carolinensis} Somerset, UK

Colin Seddon / Grey squirrel with bird feeder pulled to ground {Sciurus carolinensis} Somerset, UK

DAVID TIPLING / Great spotted woodpecker {Dendrocopus major} + Blue tits on squirrel proof garden feeder, UK

Chris Gomersall / Grey squirrel on 'squirrel proof' bird feeder. {Sciurus carolinensis} UK

Mark Payne-Gill / Northern flying squirrel feeds on feeder {Glaucomys sabrinus} Maine USA

Georgette Douwma / Grey squirrel (Sciurus carolinensis) feeding on a garden bird feeder with a Rose-ringed parakeet (Psittacula krameri) perched nearby watching, London, UK. November.

Georgette Douwma / Grey squirrel (Sciurus carolinensis) and four Rose-ringed parakeets (Psittacula krameri) feeding on garden bird feeders, London, UK. November.

Georgette Douwma / Grey squirrel (Sciurus carolinensis) and four Rose-ringed parakeets (Psittacula krameri) feeding on garden bird feeders, London, UK. November.

Ashley Cooper / Grey squirrel (Sciurus carolinensis) feeding on a bird table, Mere Sands Wood, Ormskirk, Lancashire, UK. November.

Nick Upton / Grey squirrel (Sciurus carolinensis) stealing peanuts from a garden bird feeder, Wiltshire, UK. April.

John Cancalosi / Eastern gray squirrel (Sciurus carolinensis), feeding from bird feeder, Maryland, USA. March.

Mike Read / Red squirrel (Sciurus vulgaris) beside a bird feeder, Dorset Wildlife Trust Reserve. Brownsea Island, Dorset, England, UK, March

Nigel Cattlin / Grey squirrel (Sciurus carolinensis) adult feeding on peanuts in a mesh cover bird feeder, Berkshire, England, UK, June