Snail

The snail (カタツムリ, Katatsumuri) is a small mollusk that can be found moving slowly across flowers during rainy weather. When caught, it hides within its protective shell. If a player were to disturb it, the snail would retreat into its shell, fall to the floor and disappear.

Donating to the Museum
As with all insects in the series, the snail can be donated to the Museum, by talking to Blathers who will give the player a small talk about it.

In Wild World
"I should inform you, some cultures consider snails a delicacy... That means that someone, somewhere, would eat this. How I fear for that person."

In City Folk
"Ah, if you didn't know, here's a fact for you... Removing a snail's shell doesn't make it a slug! If you did try to pull off a snail's shell-- which I surely DO NOT condone-- its insides would spill out... I... Just got a mental picture of that. I fear I shall never eat again!"

Snails can be found on the upper terrace of the insect exhibit, on the flowers to the right hand side.

In New Leaf
Upon being donated, the snail can be found in the room of the bug exhibit with the light in it, resting on a hibiscus bush near the light. The exhibit has this to say about the Snail:

"Snails are mollusks that live on land and are related to shellfish like clams and oysters. One snail can play the role of both a male and a female, so it can lay eggs all by itself. Newly hatched snails already have a tiny shell, so right from birth they are easily identified. Most species have clockwise spirals on their shells, though spirals that go counterclockwise are possible."

Encyclopedia Information
When the player has caught the snail, they can find information about the insect in the bug menu. Below is the information regarding the snail:

Further Information
Helix pomatia, also known as the edible snail or escargot, is a species of snail that is sometimes farmed for eating. It is found throughout Europe, but was introduced to Britain by the Romans.