A mosquito lurks, eager to score some Halloween candy. Ben de la Cruz/NPR hide caption toggle caption Ben de la Cruz/NPR Goats and Soda What's The Scariest Halloween Costume Of Them All? October 29, 2015 It's a bloodsucking creature. But it's not a vampire. Or a vampire bat. Here's a look at the eight deadliest animals on Earth (and a costume primer).