how do you accidentally run over baby birds with a lawn mower? how do you do anything "accidentally" on one of those shits? by riding it/pushing it blindfolded? or facing the opposite direction of what you are walking/driving in?
i once accidentally ran over a crow with my bike once when i was a kid. okay i did it on purpose, but the bird was wounded and would never survive and i was a child. i did it for the birdie.
i later buried him in a shoe box under some leaves in some bushes by our driveway. true story.