Polygonodon audax

Also known as Bulldog Fish

Xiphactinus audax was a voracious predatory bony fish that dominated the warm, shallow waters of the Western Interior Seaway during the Late Cretaceous. Propelled by a large, deeply forked tail fin, it pursued marine animals at impressive bursts of speed before impaling them on heavy, dagger-like fangs. Famous fossil discoveries reveal that individuals regularly swallowed other large fishes whole, sometimes succumbing when oversized prey punctured internal organs.