It seems that everywhere you find a group of humans, you’ll find a clan of rats hiding in the shadows. This history seems born out of opportunity for the rat, but we’ve done our part to help them get around the world rather easily. This commensalism – a relationship where one species benefits, but the other receives little or no harm – is probably the result of the sloppy nature of humans. It appears we’ve never been very good at properly stowing our trash!
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