Yeah it's not fun watching those birds get smacked by the turbine blades. And when birds fly over large solar panel banks, the concentration of heat can literally fry them, or cause them to internally get too hot. If we try to power everything off wind and solar, then there's going to be so much landmass where birds are probably not going to exist much, unless birds somehow learn to avoid them. The simple amount of landmass it would take to power the nation off just wind and solar would be astronomically huge in square miles.