Eric Baccega / Black flat-coated retriever dog splashing in water and retrieving stick (Canis familiaris)

Doug Gimesy / Platypus researcher retrieves a platypus (Ornithorhynchus anatinus) from a net that was set up to capture and help monitor the local population. Chum Creek, Healsville, Victoria, Australia. May, 201...

Sam Hobson / Seabird researcher retrieves data from high resolution GPS loggers attached to Northern gannets (Morus bassanus). Bass Rock, Scotland, UK. August

Matthew Maran / Black and white border collie with stick, Hampstead Heath, England, UK, March.

Neil Aldridge / Spaniel gundog holding a dead female Ring-necked pheasant (Phasianus colchicus) in its mouth during a winter shoot on shooting estate, southern England, UK. January.

Neil Aldridge / Spaniel gundog hauling itself out of a lake carrying a dead female Ring-necked pheasant (Phasianus colchicus) shot during a winter country shoot on shooting estate, southern England, UK. January.

Neil Aldridge / Wet labrador gundog emerging from lake with a male Ring-necked pheasant (Phasianus colchicus) in its mouth during a winter shoot on shooting estate, southern England, UK. January.

LYNN M. STONE / Labrador Retriever retrieving toy from sea, Guilford, Connecticut, USA

Ernie Janes / Yellow Labrador playing on a Norfolk beach, retrieving ball from sea, East Anglia, England, UK, December.

Ernie Janes / Yellow Labrador playing on a Norfolk beach, retrieving ball from sea, East Anglia, England, UK, December.

Eric Baccega / Black flat-coated retriever dog splashing in water and retrieving stick (Canis familiaris)

Ernie Janes / Cocker spaniel retrieving a shot Common pheasant (Phasianus colchicus), Norfolk, England, UK, December.