The X-fish, sometimes called the “bulldog fish” was an immense predator that swam the sea that covered western Kansas about 150 million years ago. Experts say the X-fish sometimes grew to more ...

Unlucky fish and unsuspecting seabirds were snared inside Xiphactinus's upturned jaw, which was lined with giant, fanglike teeth, giving it an expression akin to that of a bulldog. A 13-foot-long ...