Escargot ,
I did some research on Apple snails becuase I didnt know what they were interesting facts:
These snails will "play dead" on occasion (especially when first introduced to a new tank, probably from the stress of moving from one habitat to another), even for several days, but once the snail is acclimated it will become a surprisingly active (albeit slow motion) participant in the community tank.
Nevertheless, apple snails are considered a delicacy in several regions of the world, and they are often sold in East and Pacific Asian markets for consumption.
Unfortunately, many species have a great appetite for aquatic vegetation and algae are not their preferred food. In such cases these scavengers can reduce the aquatic vegetation very quickly. They can ruin a beautiful aquarium within days.