One of the owners of a local feed producer told me that she'd seen/had a California Golden Eagle drop down and feast on a newly born calf (they raise prize cattle). Nothing they can do about it. For me, I'm a HUGE believer in dogs: I've had an incredible dog who would chase off ANY ground-based or aerial predator: a neighbor has a full fledged LGD [Great Pyrenees] and said that it would watch eagles pick off their chickens; my shelter-rescue mutt was the greatest $72 I ever spent.
Anyway... It's a big deal ensuring that you protect your animals. They're under your care. But, sigh, with goats it's not enough to protect them from predators, you've got to also protect them from THEMSELVES! (pigs are also escape artists, but they don't try to kill themselves)