One of the most successful mobile games right now is Angry Birds, which has been downloaded more than 30 million times across different mobile platforms, with 12 million of those being paid downloads on iPhones, iPads, and iPod Touches. But on Android, the game is free, and is supported by advertising. Angry Birds has been downloaded more than 5 million times on Android since that version launched in October. “By end of year, we project earnings of over $1 million per month with the ad-supported version of Angry Birds,” says Peter Vesterbacka, the “Mighty Eagle” behind the game at Rovio Mobile.

He appears in the video above taken by Google’s AdMob team, which kicks off a mobile developer series. In the video, he doesn’t mention the $1 million a month figure, but he does reveals some other stats, such as the fact that the apps have an 80 percent retention rate, measured by the number of people who download updates. And on the iPhone alone, people spend a collective 65 million minutes a day playing the game.

He also talks about different ways to make money from mobile games—whether that is paid downloads, advertising, or toys. (Expect to see ads for the Angry Birds plush toys in the game itself).