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In page Tristan da Cunha:

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Invasive house mice on these islands have adapted to be 50% larger than average house mice. They are thought to have been accidentally introduced by 19th-century seal hunters who would dock on the islands.[3] These mice have adapted by consuming sea bird eggs and chicks (as they nest on the ground). Gathering at night in groups of 9 or 10, the mice gather at the bird's nest to feast. With no natural predators, the invasive mice population is able to expand by producing new generations twice a year.[citation needed]