Fry: Hey, what are these rings in Nibbler's fang?
Vet: Hmm. I'm still a little woozy from a gazelle kick this morning, but if he's anything like the common tree, the rings might indicate his age.
Fry: Hehe, yeah, well. Good luck. It'd take some kind of genius to count all those rings.
Vet: [looking at Nibbler's tooth for a split-second] He's 5.
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