Originally Posted by
Yvaelle
Think of it this way - when we walk around we move slowly (compared to most animals, especially birds) - when we fall down we have relatively hard bones compared to most animals, and we can fall down as tall as we are (unless we fall off a cliff or something): I'm 6'2", if I fall down the maximum acceleration my head can reach in that time is 6'2" times earth acceleration. Human beings are designed to fall throughout their lives and be no worse for wear, or run headlong into prey and get back and do it again - we're war machines - we're Orks.
Birds have shitty hollow tubes for bones to reduce weight, it's like rolled tubes of paper, and they fly headfirst - at incredible speed. If they hit anything, it's headfirst, going 30-200km/h, protected by only a sheet of poster paper for a skull. It would be like headbutting an oncoming car, when your skull is already fractured - that is how birds live their lives. Oh, and when they headbutt something at highway speeds - that is almost always only the first impact, since they are usually some distance off the ground - if they hit a wind turbine they a) hit the turbine, and b) fall 150 feet.
Birds die, that's how birds do.