Worms have a way of appearing in strange, unwanted places: inside feet, eyeballs and stomachs. Turns out some are even invading countries.

Giant predatory flatworms have inched their way into France and its overseas territories on four continents, according to a study released Tuesday in PeerJ. The invasive flatworms were documented by citizen scientists and managed to stay under the radar for more than two decades. This is the first study to cover the invasion.
Wormy Worm
The study is