I am a falconer and have caught and trained many wild raptors and hawks. 90% of all die first year, only best hunters survive. That is why they can be trained to hunt for men, it is advantageous for them to do so. they are very smart, smarter than dogs, only different. We provide food. if they don't eat on a regular basis they become too weak to hunt and die, that is why they become desperate, high matabolism and do desperate things. It is well know that Goshawks will follow men through woods because they scare up game. I can catch a redtail and within 2 weeks have it fly free and come back to my hand, (with food in it)