The profile of a killer (a high-speed digital image of dwarf seahorse). University of Texas at Austin hide caption toggle caption University of Texas at Austin The Two-Way Who Knew? Seahorses Are Stone Cold Killers: VIDEO November 27, 2013 Thanks to the shape of their heads, the inch-long creatures can creep up on their prey. Then they strike with lightning speed. Researchers have captured the way they attack on video.