Refers to this column–
http://www.straightdope.com/classics/a1_029.html
Bats may be a bigger rabies problem than you think.
And by bats, I mean Vampire bats.
http://news.bbc.co.uk/1/hi/world/americas/4398660.stm
It makes sense. Any animal that draws blood into it’s mouth to feed is a disease vector. Like mosquitoes & Yellow Fever.