Lockheed Martin designed the F-35 canopy to withstand the impact of of a 4-pound bird at 480 knots on the "reinforced windscreen and 350 knots on the canopy crown" without breaking. In other words: Chicken squadron vs F-35, fight!
At first I thought this was a ridiculous test, these plane windscreens are used to stop bullets, whats a bird.. but after calculating some momentums (ignoring bullet shapes and other issues etc) the momentum of a 4lbs bird is approximately (1.8kg)(246m/s) = 442 kg*m/s . While a .25 mm bullet is closer to (.0023)(1100m/s) = 2.5 kg*m/s.
442 to 2.5 is a crazy difference in momentum, time to load chicken cannons onto our fighter jets!