Well, ironic as it may seem, Koi are those large freshwater fish you would normally seen in a Japanese pond like the one under the bridge in the screensaver. They come to the surface to feed when people throw them food pellets. Many people keep them in their ponds (I used to own some myself) as an added visual attraction and hobby. They're actually related to the Carp, but they're far more colorful. Here's what they look like:
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