Pill bug

'' 'I caught a Pill Bug! Why don't you chill, bug?'  - Animal Crossing: City Folk''

Pill Bugs are a commonly found, land-living crustacean. They take shelter in dark, moist areas, such as rocks in order to conserve water. Pill bugs appear in all games in the Animal Crossing series.

In the Fish and Bugs menu in both Wild World and City Folk, information is given on their ability to breathe underwater do to their status as a crustacean.

Further Information
Pill Bugs, Armadillidium Vulgare, are from a genus of crustaceans that have been known to exist for at least 300 million years. Many members of the genus exist as marine crustaceans, but some have developed to live on the land while retaining their water-dependant lifestyle. Pill bugs can lay several hundred eggs at one time.

Their characteristic defence mechanism, which involves rolling into a protective ball, is copied in-game. The pill bug rolls into a ball when a Player approaches it, making the insect much easier to catch than other ground-dwelling insects.