Oops, they did it again: popular Facebook games maker Zynga last month trademarked the name FishVille and promptly launched the game by that name less than a month later. This time Games.com reports it could be pets the social games giant is going after next, with another trademark filing on the term PetVille.

236,999 likes 97 talking about this. Facebook PetVille: The Cutest Virtual Pet Game on Facebook. Get latest PetVille News and UPDATES - PLAY. Log into Facebook to start sharing and connecting with your friends, family, and people you know.

It makes perfect sense. In the same way that FishVille targeted rival company CrowdStar's popular Happy Aquarium game concept, PetVille would neatly knock on the door of rival Playfish's successful title Pet Society.

Zynga is perhaps best known for its wildly popular game FarmVille, but is clearly not content to rest on its laurels and is aggressively building out social games with similar casual mechanics and a reportedly impressive revenue stream from in-game currency sales. Just how big is the social games space? Big enough to prompt industry-leading video game publisher Electronic Arts to snap up Playfish for as much as $400 million.

With shorter development cycles and growing revenue streams, it's no wonder the traditional video games industry is taking notice, as sales data from consoles and software continue to plummet. For many of the same reasons, the industry should be worried about Apple's iPhone too.

Do you play casual games on Facebook? Have you ever spent real money on virtual goods?

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Zynga is a leading developer of the world’s most popular social games that are played by millions of people around the world each day. We are headquartered in San Francisco and have additional offices in the U.S, Canada, U.K and India. Since our founding in 2007, our mission has been to connect the world through games and delight consumers with social gaming experiences. To-date, more than one billion people have played our games across Web and mobile, including FarmVille, Zynga Poker, Words With Friends, Hit it Rich! Slots and CSR.