So you can pick them up when they're dead without feeling like you've actually touched it.
They are pest and can produce by the hundreds in no time. They have up to twenty-two babies in a litter. Consider those twenty-two having twenty-two of their own and etc. The tails are to catch then in the traps in case they are too wise to move quickly. The tail gets caught on the trap and it's dead. There is a reason for everything and I hope this is theirs.
because rats lie to much ha ha
Lizards can drop theirs and re-grow them
all the better to make necklaces out of?