Penguin

The Penguin was introduced in The Sims 2: Seasons. It can appear on your lot in any season, but you are most likely to see it in winter. The odds of the penguin appearing on the lot are higher if:
 * There are fish placed on the lot, either on the ground or mounted.
 * A golden Trout, either raw or mounted, is anywhere on the lot.
 * It's snowing.
 * There is light or heavy snow accumulation.
 * If there is a snowman existing on the lot.

If you see a penguin, there are several things he can do:
 * If there are any fish placed on the ground, he can eat up two during the visit.
 * He's attracted to wall mounted fish, even attempting to overcome evolution by flying up to them, he won't be able to reach them though.
 * He chatters at any snowman or scarecrow he encounters even if the snowman is broken.
 * If there's heavy snow accumulation, he can slide around the lot.
 * He may leave some Penguin pee behind.
 * You can pet him for some social or shoo him from the lot.

Player Stories
I find this creature to be amazingly cute. He comes to my lot in the winter almost daily and it's obvious he loves my sims as well. I pet him while on the lot and he sometimes comes into my house. He's cute, I just can't stop saying it.