The X-Files, Season 5

Mulder:
(about whatever monster is lurking in the forest) Maybe it can regulate its temperature. You don't know of any animal that can?

Scully:
Ticks. I've heard they can halt their metabolism for up to 18 years, essentially going in to suspended animation until something warm-blooded comes along.

Mulder:
That's interesting.

Scully:
Why is that interesting?

Mulder:
Thirty years ago, the town of Point Pleasant, West Virginia, was terrorized for over a year by something. Killing livestock, terrorizing the people. Witnesses described them as primitive-looking men with red, piercing eyes. Became known as the "Moth Men." I've got an X-File dating back to 1952 on it.

Scully:
(dryly) What would that be filed next to? "The Cockroach that Ate Cincinnati?"

Mulder:
No, "The Cockroach that Ate Cincinnati" is in the "C"s. Moth Men's over in the "M"s.