Google's data centers may not be surrounded by moats filled with sharks with friggin' laser beams on their heads. But one of them has a pond full of alligators.

At its data center campus in South Carolina, Google is using three large basins to collect rain water, which it then uses in the cooling system for its servers. The water must be filtered before it can be used by Google, a task that was complicated by the appearance of algae blooms.

Google's solution was to introduce tilapia in to the ponds. The tilapia is a fresh water fish that eats floating aquatic plants, and reuces algae blooms. They're also a popular menu item in restaurants - hence the next challenge.

"Nature takes it course, and an alligator moved in to begin eating the fish," Google's Joe Kava said during a keynote presentation at the 7x24 Exchange in Phoenix. "So we wound up with a four-foot alligator living in our pond."

That's a feature that not many data centers can claim.