Andres M. Dominguez / Hawthorn berries (Crataegus monogyna) in Poplar woodland (Populus) Sierra de Grazalema Natural Park, southern Spain. October.

Andy Sands / Girl smelling Hawthorn (Crataegus monogyna) blossom Hertfordshire, England, UK, May

Will Watson / Cranefly (Ctenophora pectincornis) on Hawthorn (Crataegus monogyna), ancient semi-natural woodland, Herefordshire Plateau, England.

Gary K. Smith / Common hawthorn (Crataegus laevigata) blossom on white background.

Dave Bevan / Pair of Wood pigeons (Columba palumbus) perched in a Hawthorn tree (Crataegus monogyna), exchanging food, Gloucestershire, England, UK, June.

Sylvain Cordier / Fat dormouse (Myoxus glis) eating fruit of English hawthorn (Crataegus laevigata), Alsace, France

Stephen Dalton / Hawthorn tree (Crataegus monogyna) in full leaf in spring, Sussex, UK May

Matthew Maran / Hawthorn tree flowers (Crataegus laevigata) Hampstead Heath, London, England, UK. May.

Matthew Maran / Hawthorn tree leaves (Crataegus laevigata) Hampstead Heath, London, England, UK, March.

Will Watson / Midland hawthorn (Crataegus laevigata) in flower, Tiddesley Wood Nature Reserve, Worcestershire, England, UK, March.

Will Watson / Midland hawthorn (Crataegus laevigata) in flower, Tiddesley Wood Nature Reserve, Worcestershire, UK, March.

Paul Hobson / Tawny Owl {Strix aluco} sitting on side of hawthorn, winter woodland, Derbyshire, UK

John Waters / Winter woodland landscape with Oak, Hawthorn & Holly. Quantocks, Somerset, England

Nick Upton / Social pear sawfly (Neurotoma saltuum) (Pamphiliidae) larvae feeding within silk tent on Hawthorn leaves (Crataegus monogyna) in woodland, near Trowbridge, Wiltshire, UK, June.

Robert Thompson / Hawthorn (Crataegus laevigata) flowers, Brackagh Moss National Nature Reserve, County Armagh, Northern Ireland. May.