Yeah, and they can be very scratchy. :D

  me: "(apologetic) A small amount of urine escaped. The rat was not to blame."
  wife:  "(sternly) The rat was *totally* to blame!"

Just woken up and seen this after picking up my laptop, but only after feeding the cat, taking dog out to poop, and feeding the rats a few puffs.

They are such little characters, full of so much love and joy.

Just the short lifespan is the biggest downside. :(