I learned this growing up on a farm- the laws of physics/nature do not apply to felines and rodents. I've seen rats as big as a man's fist teleport underneath the crack of a door, with less than half an inch of space. These creatures have access to some form of teleportation technology. This is common knowledge on the farm. Jokes aside, I'm only being partly facetious; rats can squeeze into spaces that they really *shouldn't be able to.* Question- you have a dog or a cat? If so, I'd imagine they are very interested in w/e is making that noise. As long as you hear that noise, the animal is probably still alive. If it's *stuck* somehow, it'll be dead before you reach it. You can drop a nuke on a rat and it might survive. If it gets stuck somewhere, though, it's done for. This is the property owner's responsibility to deal with. There are sanitation standards they must abide by. Keep a record of this incident, in order to protect yourself- idk your landlord, idk if he's a good guy or if he's an asshole that'll try to make you pay for this somehow. You've done what you are obligated to do- reported the problem as soon as you could. Now, your landlord is legally obligated to deal with it. Good luck. I'd be curious to see an update post as this story unfolds. Keep us posted, yeah?