The rat traps we set in our crawlspace caught not one but two rats! Hopefully this will resolve our recent rat issues... we're particularly hopeful because the third trap we set wasn't disturbed, and one of the sprung traps was still baited. Presumably this means no one was left to eat the bait.
So, we also cemented up the hole they were getting into the crawlspace through.
Smashed rats are kind of nasty. At least they probably died quickly.