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Since the 1970s, humans have been entranced by the songs of humpback whales, for example.

In the coming weeks, rescuers are waiting to see if a group of humpback whales feeding in an algae bloom hotspot near the Channel Islands will become sick and come to shore.

Domoic acid has been found in blue and humpback whales, as well as Guadalupe fur seals, which is a threatened species.

Ms MacLennan said an incident in January when a humpback got into difficulty at a Skye fish farm was particularly unusual.

In February, two fisherman rescued a humpback whale found entangled in creel fishing gear off the coast of Skye.