Dodes, I would have to disagree with your statement about squirrel hawks and rabbit hawks. Ive seen a number of squirrel hawks that we bring out rabbit hawking that when we give the game call they just look up, and the bunny is gone. Or they just dont give chase at all.
Goes the other way, we have brought rabbit hawks squirrel hawking and when the game call is given they look down, and the squirrel runs over their head. To be sucessful on both you need to hunt both. Don't expect to bring an amazing squirrel hawk that hasnt chased bunnys, bunny hawking and get somthing. Or bring a great bunny hawk that hasnt chased squirrels, squirrel hawking.
The individual animal squirrel or rabbit is equaly hard to hunt. It tends to boil down to what you have more of. If you have a spot with a ton of rabbits, rabbits seem the easy prey and squirrel the harder. If you have a ton of squirrels, they are the easy prey. Sort of a game of chance, your going to score more with what there is more of. To be successful on eather the bird needs to learn to hunt eather.