When watching eagle nest cams, I've seen little birds and mammals hanging around eagle nests and scooping up scraps of leftover prey. I think in many cases a large raptor isn't going to go chasing around a little birds when they've already caught something bigger and the little birds play clean up crew and take away scraps that would be too small for the larger birds. Not sure if that's the case here but it's a cool little cooperative situation to notice. You'll also see little birds nesting under osprey nests, probably for the same reason.