Do snails 'have a homing instinct'?
A 69-year-old amateur scientist may have proven that garden snails have a homing instinct.
Ruth Brooks became exasperated with snails in her garden ruining her plants, but was reluctant to kill them. Working with a biologist at Exeter University, she helped devise a series of experiments to assess the snails' alleged homing ability.
The result has astonished some professionals who believe that snails are far too simple creatures to find their way home.
The BBC's Science Correspondent Pallab Ghosh reports.