Angry Birds Red’s Mighty Feathers level F-15 is a tough one to 3-star. To earn three stars you have to save the egg, pop 7 pigs, and use no more than 12 birds. As I said, this level is very hard, so bring your patience and watch the video. Thanks to @lostgreybird and @lukazzz for providing very detailed text strategies below.
If you have a different strategy for completing this level feel free to leave a comment below.