Second, once you discover where they are likely to be, you will be amazed at just how many - and how many kinds - there are. Most of the common ones (like mine) are invasive species, though some have lived here in America for a very long time.
They are extraordinarily colorful, and have cool names, like the asian tramp snail, or the florida scrub snail - both of which I have found in South Beach,which seems oddly appropriate.
I have learned an enormous amount about science and natural history from studying them in the wild, and studying their behavior in temporary captivity.
They are a scalable (simple to amazingly complex) case study in evolutionary biology and genetics.
They are easier to catch than rabbits, parrots, raccoons, snakes or lizards -all of which I have kept as pets, and none of which I would recommend as pets.
They don't live as long as turtles,which means less long term responsibility - I am not prepared to make another 20 year commitment to a box turtle.
If you look closely, you can see them smile when you pet them.
If they get out of their container, they are easy to find: Just follow the slime trail.
Properly prepared, some species are delicious - though I would never eat mine, and appear to have lost my taste for escargot for the present.
Sometime I will tell you why I hate most water snails, especially periwinkles!