Basic pond snails. I think they're funny. They do this shake with their shells--kind of twisting their shells back and forth (don't know what for). They have a funny sense of humor too and seem to like to lay their egg gels on other type snails they are sharing a tank with. Some of mine will eat anything I put in there and some of them won't eat people food and prefer tank algae (and, I would assume, plants but I never give them any aquatic plants except for anacharis). Low maintenance (water can get a little dirty before you have to clean it, they don't care if it's greenwater either). They can grow to a nice size (for pond snails)--maybe 1/2-3/4 from stem to stern. I like them and puffers like them a lot.