Ernie Janes / Jack russell terrier in box with Christmas tree

Ernie Janes / Jack russell terrier in wheelbarrow with apples, UK

Jack Dykinga / Burrowing owl (Athene cunicularia) fledgling aged one month tilting head to judge distance. Marana, Arizona, USA. May.

Mark Taylor / Blue merle mutt sitting with head tilt.

Eric Medard / Barn owl (Tyto alba) among hay stacks watching Brown rat (Rattus norvegicus) with head tilted to side. Mayenne, Pays de Loire, France.

Markus Varesvuo / Male Shoveler (Anas clypeata) on water with head tilted, dabbling for plant food, Loviisa, Finland, June

Mark Taylor / Jack Russell Terrier x Chihuahua pup, Nipper, sitting and looking quizzical with head tilted.

Mark Taylor / Jack Russell Terrier x Chihuahua puppy, Nipper, standing and looking quizzical with head tilted.

Petra Wegner / Male Beagle, lying down with head tilted, 11 months

Petra Wegner / Male Beagle, lying down with head tilted, 11 months

Petra Wegner / Coton de Tulear with head tilted, 7 years

Petra Wegner / Coton de Tulear looking with tilted head, 7 years