I get that they are essentially lizards. There's no doubt. They don't feel love or anger or compassion. But they do feel fear. They hide from circling predatory birds and even airplanes. Is not fear just a self preservation response?
And some chickens are mean, some are overly skittish...
With old retired layers that are very personable, I want to make it as quick and comfortable for the old girl as possible.
Even swinging the axe seems to excite them, never mind putting hands on them. So I get them comfortable and relaxed and put a 22 right behind their ear.
Instantly drops...
Not necessarily.
It definitely depends on the type of ammo and the shot placement.
I hit a fully grown rooster with a CCI mini-mag hollow point out of a rifle. The round hit the rooster just behind it's eye. It did a back flip and ran away. It could still see and reacted like it could also...