Modern domestic cats appear to have all originated in one of two places. The first was Anatolia, which roughly corresponds to modern-day Turkey. These cats spread to Europe as early as 4,400 B.C.E. A second domesticated lineage appears to have begun in Egypt and then later spread through the Mediterranean. And wherever the cats followed humans, they also interbred with the native wildcats already there.
This DNA exchange went both directions along the trade routes, too. That led to what, at first, seemed like baffling results in the ancient DNA. For example, a 2,000-year-old cat in Egypt had DNA sequences typical of wildcats in India. Claudio Ottoni, another member of the research team now at the University of Oslo, remembers thinking it was a mistake when he first got the sequences back on his laptop. In fact, that cat was found in an ancient Roman port city called Berenike, which was directly connected to trade routes in the Indian Ocean. Humans brought cats onto ships to catch mice and, in the process, spread cats all around the world.
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