To sum it up: "However, constriction often kills small mammals faster than would be expected if suffocation were the immediate cause of death. In many snakes, constriction may be strong enough to collapse the blood vessels in small prey, which in turn would quickly stop the heart from working and lead to heart attack and stroke."
the movement of the mouse after it is dead is due to the nerves. it happens all the time with people after they have passed away. My mother used to work in a nursing home and would help dress the dead. It wasnt uncommon for an arm to go straight up days after the person had died. So even after a person/mouse/whatever it might be has died, it still could move
for the comments about hearing noises from the mice as the snake starts to swallow it-it could be air being pushed through the lungs. when the air gets pushed out of the lungs up into the throat, noises can be produced. i live on a farm where we shoot groundhogs to stop them from digging up the ground. We shot one that was still 2/3 of the way in the hole and i had to get it out. when i took the shovel under the stomach to pick it out of the hole a noise was produced. scared the crap out of me. the thing was dead for sure, it had a bullet hole right between the eyes. the force of the shovel pushing the air out of the lungs and up into the throat had produced the noises that sounded like grunts and squeals.
to sum that up: dead things can move because of nerves and can make noises if air is pushed out of the lungs and into the throat
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