In 1964 researchers discovered the sharp beaked ground finch aka the vampire finch. FOR REAL!!! These finches have adapted to long hot dry seasons by drinking blood.
Take a look at these blood thirsty birbs on Galapagosislands.com
National Geographic vid of the Vampires in action! Not for the faint of heart!
In case you wanted to give it a listen: Ologies Vampire episode with Dr. Jeff Holdeman