Yes, we are hearing that Angry Birds developer Rovio has apparently turned down a takeover offer. The offer was rumored to have been worth $2 billion. (Yes, that is billion with a “B.”)

While sources are sketchy on some of the particulars, word is that Zynga is the one who made the offer. Whispers followed by rumors last year were rampant that Rovio was a target for takeover, and a number of firms were trying to get a deal done. Until now, no specifics had materialized.

As to why they didn’t accept the merger offer, only Rovio knows, and it is likely that we will never know all of the sordid details. A source we spoke with claims that Rovio is simply not interested in being acquired. This source speculates that “…they are doing so well and enjoying so much success that it just does not seem the right move to be acquired.”

Despite the fact that the latest Angry Birds release has already racked up over 10 million downloads in just three days does seem to indicate that they don’t need to be acquired. Still, our source expects others to continue to try to persuade Rovio that a takeover would be the best way to go for the long term.