The other night Jack managed to drag in a bird.
Given that he was wearing what I swear is the loudest bell on his collar that you can get without earplugs and a permit (it really is very intrusive, and makes jack jingle like santa’s sleigh whenever he walks) I can only assume that either Jack was very very cautious, slow and clever about his hunting, or that his prey was the dumbest (and possibly deafest) bird in existence.