This is a quick video I put together after doing an animation of a butterfly and a ladybug for the kid’s educational application. The reference image of the flying insect had an odd way to animated the wings. 
Rather than flap the wings they were just rotated. A way to animate wings that seems rather common. The deform instead of the rotation is not much hard but the results are a lot nicer in my opinion. 



Here are the animations as gif images to get a better look at them:


I hope you enjoyed this quick video that is off topic but I will finish the complete game art series next and make the assets available