Happy Aquarium's release of the lost Baby Polar Bear last week was also accompanied by the launch of the new arctic themed demo tank. As you can see, the Polar Bear cubs featured there are now all grown up!

So how do you get these bears? Well, while the demo tanks are suppose to function as stores, it seems that clicking on the bears in the tank won't get you a "Buy" prompt. The bear cubs are currently an exclusive lost item, so you'll have to count on your friends to share their sightings on their Walls.

But a bright-eyed, ears-wiggling, baby Pink Polar Bear is available at the in-game store for 48 Facebook Credits or 58 Pearls. She's got a maturation rate of 72 hrs. and can be mated with the normal Polar Bear.
If the price of the bear is a bit steep, and you love animated items, I recommend checking out that snowy mountain ridge in the tank's background. The ski lifts actually climb the mountain! And it's way cheaper at 11 FB Credits or 13 Pearls.