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So too, as a result, has our understanding of their unique forms of communication, which turns out, in the sperm whale at least, to be structured, complex, and expressive.

A sperm whale which died on Monday after washing up on the island of Raasay had been entangled in ropes.

A sperm whale that died after stranding on the Isle of Harris in November 2019 had a 100kg "litter ball" in its stomach.

There are many other large whales, including blue, fin, sei, humpback, gray and sperm whales.

The scientists mapped and quantified movement for four globally distributed large whale species — the blue, fin, humpback and sperm whales — based on 435,000 locations and then related the data to global shipping activity.