Halloweenology - The Bats of Halloween
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Check the Blog for some decorations with bats.

Bats

Bats are flying mammals are what many people find ugly or frightening. Because bats are only out at night, they have association with things that are dark and evil. Although most bats eat insects and some eat fruit, a few bats will dine on blood, which led Bram Stoker to write that they could be transformed vampires

Bat's have bad eye sight, thus they have exceptionally good olfactory and hearing senses. Many bats use shrieking and listening to the echoes to figure out where they are in relation to their surroundings. This natural radar is so powerful they can even hunt for small insects with it. The night-time shrieking, of course, only makes them seem even more scary to the easily frightened city dweller.

Urban legend has it that bats try to entangle themselves in people's hair, which of course is foolish.
Because they are active at night, emit high pitched shrieks, look creepy, and drink blood, most cultures give negative connotations to the bat. Many Native American tribes attributed the bat as a trickster spirit. Of course, anything that seems to be evil eventually gets associated with Halloween, and bats are no different.