Today I read an article about tarantulas. There was a bit where it talked about a pet tarantula which was kept in an aquarium with multicoloured gravel in the bottom, and the spider, apparently not having anything better to do, spent a few weeks meticulously sorting the gravel into piles by colour. In other words, not only are tarantulas big, hairy, ugly, and have colour vision, they are smart enough to get bored. This worries me deeply.