Both snails and slugs are land gastropods. The only difference between the two is that slugs lack visible shells, while snails do. It is possible for slugs to have shells, but they are not as visible as snail shells.
Slugs and snails thrive in various environments like meadows, forests, gardens, and even backyards. Birds and hedgehogs often see them as food, but many view them as pests that damage plants and crops.
Appearance
Snails have a distinct spiral shell, while slugs lack a visible shell. Most land snails are small, roughly 1 to 3 inches long, though the giant African land snail can reach about 8 inches. Slugs, despite having no shell, can grow large too: the ash-black slug reaches around 12 inches.
Habitat
Snails have it easy as they carry their homes. Their hard, protective shells let them retreat from predators and rest in bad weather like rain or snow.
Slugs lack a protective shell, exposing them to colder temperatures and harsher weather. They’re more likely to be eaten by larger animals. However, they can easily shelter in narrow openings in logs, leaves, and other ground debris.
Speed
Slugs are faster than snails since they don’t carry shells. While different, both land snails and slugs move similarly. They produce mucus to glide and use their antennas to guide them.
