When it comes to intelligence, fish get a bad rap. They’ve been plagued with the five-second memory stereotype, and thanks to Dory, are thought to “just keep swimming.” But a new study suggests that they might be smarter than we think.

Research published today in the journal PLOS Biology shows that fish can recognize and respond to themselves in the mirror. When met with their own reflections, a species of fish called the cleaner wrasse identified and attempted to remove marks on their bo