What you do is go kill it with a small sharp object, take pics, and put it in a bag in the freezer. I have no clue why, but I would like to see a pic next to a ruler.
That is kinda freaky. just get it out of your garage if youre humaine, maybe even set it free, but if you're not some peta ass bitch you can kill it. I reccomend letting it fly away.