They aren't particularly noted for their brains you know.
Not sure that everyone would agree with your quote Brooksy the eagles in this video are only trained as youngsters and then only used to hunt their quarry for 4 years before being permanently released back into the wild to enjoy the rest of their lives and breed back in their own habitat etc.
Google the videos that show where eagles know that a particularly large mountain goat is to big for a straight forward kill with their talons but the eagle has the intelligence to figure out that, "with speed and strength if the eagle can un-foot and force a mountain goat over the side of a high enough ledge the goats resulting fall will assure some dead meat at the base of the fall etc.