The fourth level is one of the trickiest in the Teamwork section. This will take quite some time to get the right angle.
To get all 3 stars, you will most likely have to hit everything in one go. While hitting everything with 1 hit isn’t too difficult, you have to get something over about 130K points to get all 3 stars. These points will mainly come from the crashing/collision of the wooden objects.
Pay close attention to the location of my mouse when I release the bird. Replicating that can save you a whole lot of time.