Dr. Desmond tried to swat the creatures as they darted in to attack him. Each time one hit him, it was like being stuck with a sharp needle. Drops of blood dripped down after each attack. And they were so damned fast.

As he cowered in the corner of his lab, trying to stay alive, the geneticist realized it had been a really bad idea to combine the DNA of vampire bats with hummingbirds.