This article was originally published on Critter Science.

The planarian, aka flatworm, can be found in freshwater, marine, and terrestrial environments. They need either a moist, humid, or watery environment in order to survive. Take that away and they die. Not only do they live all over the world, but they’re also found in laboratories, as they’re used […]

Thanks for reading! Follow Critterman for more updates and insights.