During his investigation into the Anomalous Phenomena of Gravity Falls, Ford Pines discovered the town's infestation of giant vampire bats, believing the summer heat to have drawn them from their caves. Ford was particularly unsettled by the locals' dismissal of their presence as mosquitos, noting their use of garlic necklaces rather than bug spray, and theorized the bats were sufficing human blood for cattle and sheep.
In "Tourist Trapped," when Dipper is going through some of Journal 3's pages, their entry is briefly seen.
In "Scary-oke," when Dipper finds out about the invisible ink in Journal 3, with the invisible ink it is revealed that the Vampire Bats are actually fruit bats. Over the word 'VAMPIRE' the author wrote 'FRUIT.' He sketched out a pear and grapes on either side of the bat illustration. And crossed out the eyes of the bat head drawing. Over the detailed notes he wrote a new message which is underlined.
A real one is seen in "Northwest Mansion Mystery," appearing on the front cover of the newspaper that Preston Northwest is reading. Sheriff Blubs, Deputy Durland and Dipper are on the paper too, and Dipper is seen trying to electrocute the creature.
As stated in Journal 3 they have a ten feet wingspan, which is longer than the average human height of six feet. They seem to resemble a very large Common Vampire Bat. Besides the size, the only real difference is the large, hairy tuft on its head, which other vampire bats lack.
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- Intro: "Gravity Falls Main Title Theme"
- 201. "Scary-oke" (pictured)
- 210. "Northwest Mansion Mystery" (pictured)
- 219. "Weirdmageddon 2: Escape From Reality" (pictured)