As DISCOVER has covered before, ants are pretty much the greatest creatures around. Lots of mimics therefore try to pass themselves off as ants, but one of the cleverest is this dark-footed ant spider, seen here crawling around on a leaf with some scale insects.
Besides looking like certain ants, these spiders almost always travel in groups. Why? Researchers showed that if the ant-mimicking spiders were attacked, they'd be exposed as frauds and eaten by predators with a taste for spiders. So, it's best to never be attacked at all. Why risk it? Thus the spiders travel in groups (just like the social ants do), which reduces the likelihood they'll be attacked in the first place.