The Doozer (or Dooser, Encyclopaedia valeriensis) is a small brown critter present in Creatures 2. Normal Doozers' only purpose in life is to wander about the World, teaching Creatures words - either by randomly blurting them out or when pushed by the Hand or a Creature. They do not need to eat to survive and greatly dislike getting wet. If fallen into or dropped into water, they will attempt to leap out with an amusing shriek. Because of this, the topic of Doozer torture came up on AGC.
The default doozers are inedible, unless the Eat Meat COB is used.
Doozers also have a purple-hued cousin that lives underground in the Incubator area. It supposedly throws stray tomatoes to the surface and is not removable from its natural habitat in the normal course of the game.
Doozers also appear in the PS1 game, Creatures: Raised in Space, but are referred to as "little animals". They do not teach your Norns vocab, but they will become angry and attack them if kicked.