Vanishingly few - the housecats are the ones threatened - bald eagles eat them for one. Second two smaller ones seldom dawdle on the ground and are neither easy

Vanishingly few - the housecats are the ones threatened - bald eagles eat them for one. Second two smaller ones seldom dawdle on the ground and are neither easy to ambush nor an easy fight even assuming a type small enough to be a threat. An eagle would need to be essentially already doomed in the wild or very young in a too obvious and accessible unguarded nest which could be threatened by say a squirrel nest raiding.