Analysis of information sources in references of the Wikipedia article "Rùm" in English language version.
quoting The Times[dead link ]
On a cold January day, the sun sets early and rises late, yielding to a blackness that envelopes the island, a blackness so deep that the light of stars manifests suddenly at dusk and the glow of the moon is bright enough to navigate by.
Dr Butt believes the Rum worms are bigger than average due to their remote, undisturbed location, with good quality soil. Rum also lacks predators such as badgers, moles, hedgehogs and foxes which would usually gobble the worms before they had chance to grow into monsters.