Spam filters and AI help figure out what animals do all day

The pond-dwelling Hydra is not a very complex little animal but it does have a complex repertoire of moves that aren't clear until after extensive human observation. Examining these moves took a long time and scientists were never sure that they had seen all of them. Now, thanks to an algorithm used to catch spam, researchers have been able to catalog all of the Hydra's various moves, allowing them to map those moves to the neurons firing in its weird little head. "People have used machine learning algorithms to partly analyze how a fruit fly flies, and how a worm crawls, but this is the first systematic description of an animal's behavior," said Rafael Yuste, a neuroscientist at Columbia University . "Now that we can measure the entirety of Hydra's behavior in real-time, we can see if it can learn, and if so, how its neurons respond."