Snails belong to the class Gastropoda, a classification that includes land, freshwater and sea snails and slugs. Snails’ ancestors are one of the earliest known types of animals in the world. There is fossil evidence of primitive gastropods dating back to the late Cambrian period; this means that they lived nearly 500 million years ago.
Land snails range greatly in size. While some of them are only a few inches long and often weigh only a few ounces, there are land snails that reach almost 12 inches, like the Giant African Land Snail, a species endemic of Africa.
One amazing thing about these species is that…Snails can sleep for 3 years without eating.