Analysis of Police Scotland data shows that officers found nothing in almost two thirds of cases.Read more
The Nine reporter
It is hoped the footage from the Inner Hebrides will reinforce a case for conservation in the area.
Researchers are trying to identify the group spotted off a Scottish island last year.
An injured man is rescued from a boat off the coast of Lewis.
A medieval chess piece bought for £5 in the 1960s sells for £735,000.