It makes perfect sense that true vampire bats are neither:
A. (exclusively) frugiverous, or
B. (exclusively) insectivorous
That is all.
//
Note: An alternative title to this post is, “Why I love the Discovery Channel,” but I really am reading a journal of an early explorer: Head Hunters of the Amazon: Seven Years of Exploration and Adventure
(Thanks to Y0j1mb0 for the link)
I, for one, am going to try to work the word “frugiverous” into my daily conversations.