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I don't get that at all. If the animal is being eaten then it is removed from the gene pool and any influence over the population. What evolutionary advantage is
gained by not feeling pain during death that would enable that animal's offspring to have a better chance of survival over an animal that did feel pain while it
is being consumed?
You know how when you hang a chicken upside down, it goes really still? It's called hypertonic immobility. Most small prey animals have this ability. When they go still like that, they can fool a predator into missing their hiding location or growing bored and leaving them alive and alone. It's an effective survival mechanism.
When they go into hypertonic immobility, scientists have discovered that the animal experiences a flood of serotonin to the brain. One of the benefits of serotonin is that it can normally reduce the intensity of pain signals to the brain and relaxes the body.
So, this trait would end up being passed on through countless generations of animals who survived encounters with predators.