"There isn't a native bird in NA that doesn't have an inherent fear of anything that looks like a cat."
When I was in Tucson and active in falconry, I had a friend with a Harris' hawk that loved cats. My friend was unhappy about it, especially when several feral cats found a way into his hawk's pen. Cats are greasy and really put the weight on a hawk. My friend would finally get his bird down to a good flying weight and then he'd go out to find another 1/2 eaten cat in the pen. He finally found and patched the hole, but he lost ~ 3 weeks of hunting that season.
Ron