My theory on deer is that if you don't hit them in a way that shocks/breaks their spine, but you still make a very good shot, they will die in 5 seconds. So will a human. The difference is that we flop around on the ground and complain about it (I assume). Their only response is to run like hell no matter what. So in 5 seconds they cover a lot of ground even though they're in the act of dying.
My first deer was a perfect 60 yard shot in the heart. It ran 100+ yards and due to no pumping heart, left no trail (drop every 5 feet on fall leaves). My uncle was a great hunter and tracked it and we found it.
Birds could be a different matter, they do tend to flop for more than 5 seconds even with their head removed.
The permie formerly known as "Mike Jay"
"Hundreds of years from now it will not matter what my bank account was, the sort of house I lived in or the type of car I drove... But the world may be different because I did something so bafflingly crazy that it becomes a tourist destination"
Talk sense to a fool and he calls you foolish. -Euripides A foolish tiny ad: