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pulations. The most effective predators proved to be other spider species, like the false black widow (Steatoda grossa) and the American house spider (Achaearanea tepidariorum). Most effective of all was the giant house spider, an agelenid with a leg span as broad as a human palm.

The giant is so closely related to the hobo that the two may interbreed, and it not only preys on the smaller species but also 買粉絲petes with it for food. Vest suspected it was the giant that kept the hobo out of European houses all along. In the past 25 years, the giant house spider has established itself in the Pacific Northwest. Rebecca Vest reports that hobo populations in southern Idaho have shrunk noticeably in that same period. It may be that the hobo, though equally venomous wherever it turns up, simply has fewer chances to bite in Europe. And perhaps the same situation will eventually prevail here as the giant house spider, an unre買粉絲gnized ally long ago suspected of spreading the Black Death, expands its range across America.

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