Sheep is a sheep herding game. Unbeknownst to most people, sheep are actually aliens that were sent to observe the earth millions of years ago. In the process, they were dumbed down to the sheepish mammals we all know and love today.
In this Lemmings-inspired game, your goal is to herd sheep across 28 hazard-filled levels so they can be rescued by their educated alien cousins. You play as one of the four sheep herders. These are the humans and dogs Bo Pee, Adem Halfpint, Motly and Shep. You herd four breeds of sheep and have to protect them from the evil mr. Pear.
Official Webpage (Mac) (The official product page for the Mac version of Sheep on the publisher's website, which provides a profile of the game, an overview of the story and characters in it, an OS X patch, and ordering information, among other such things.)