Microscopic vampires may have prowled the ancient seas around 750 million years ago. The fossilized remains of their punctured victims may be the oldest direct evidence of predators hunting eukaryotes, a domain of complex organisms that includes plants and animals… The predators perforated holes in their prey and then slurped the victim’s juicy innards, Porter proposed. This predation helped drive single- and multicelled eukaryotes to evolve innovations such as skeletons and the ability to burrow as they fought to survive, Porter suggested… The early emergence of predation makes sense, says Paul Falkowski, an earth systems scientist at Rutgers University in New Brunswick, N.J. “Once you make an organism, somebody else will figure out a way to utilize its juices.”