We think we know what a cat’s purr means

Cats often purr when they're grooming each other (Credit: Marjan Debevere)

Cats will often purr on their own - it's believed it promotes bones and tissue growth (Credit: Alamy)

Marjan Debevere says in her experience no two cats purr the same (Credit; Marjan Debevere)

The purr from a happy cat may also be of benefit to human health (Credit: Alamy)