If you could not tell from the trailer, the goal of Flock! is to use a flying saucer to herd the animals of each level into your mothership (or "Mother Flocker"). There are several different types of animals to deal with in addition to the aforementioned sheep. While they share one trait in that they're terrified of your saucer, they react to you and the environment in different ways. Pigs, for example, roll about and collect mud on their bodies, while chickens will dart quickly away from you through short-range flight.