Snails
Snails are generally split into three (3) groups: land snails, sea snails, and freshwater snails. Land snails make excellent pets for young kids, who can learn from watching them crawl, eat, grow and breed. Sea and freshwater snails come in a variety of vibrant colors, breathe using both gills and lungs (depending on species), and make excellent aquarium janitors by eating algae, uneaten food, dead plant matter and debris.