As a student engineer I was told a (probably apocryphal) story about British Rail borrowing a "chicken cannon" normally used to test jet engines, to test the windshield of a high speed train. A chook was shot at the train, and not only penetrated the windshield, but the rear wall of the driver's cabin, doing quite a bit of damage to the machinery behind.
Upon discussing this unexpected result with the supplier of the cannon, the famous words were uttered:
"You did thaw the chicken, didn't you??"
Mass alone, momentum (mass x velocity), and even kinetic energy (1/2mv^2), is not the whole story; hardness is very relevant.