The headline says it all: Rovio has announced that its Angry Birds games have been downloaded more than one billion times on all platforms.

That covers downloads of Angry Birds, Angry Birds Seasons, Angry Birds Rio and Angry Birds Space. The company announced the news with a brief YouTube video:

The milestone comes just days after Rovio announced some figures from its 2011 financial year, when it made €75.4m of revenues and €48m of earnings before taxes, ending the year with 200m monthly active users across all platforms.

Oh, and here’s an interesting stat: Rovio said the Angry Birds games had reached 648m total downloads by the end of 2011. That means that in the first 130 days of 2012, the franchise has generated another 352m downloads – or 2.7m downloads a day. Now that’s what we call momentum.

Here’s that video, which incidentally hints at a new, non-Angry Birds game for Rovio. It’s already being reported elsewhere online that this may be existing iPad game Casey’s Contraption, with the game (or its developer Noel Llopis) possibly acquired by Rovio. “Before rumors start flying, Rovio is a perfect gentleman. Not a Zynga at all. Don’t worry, all is well,” tweeted Llopis, in response to questions about whether Rovio had ripped off his game.