x2. Most humane (and cheapest) is to do a cervical dislocation if at all possible, or simply remove the head. I had a hen ripped open by a hawk and immediately ran inside to watch a video so I could put her down as fast as possible. Admittedly I failed to dislocate as it was my first time...
Hate to say it but so far when it comes to chickens I've just done it myself. Same with all their medical care thus far. Like I had a bird that was mortally wounded by a hawk and I didn't want to make her wait for a vet or even someone else to do it, so taking care of it immediately felt like...