Sturgeon are among the oldest fish on Earth, yet many present-day sturgeon species are at threat of extinction, with 17 of 27 species listed as “critically endangered.” Sporting an armor of five rows ...

Xiphactinus was one of the largest bony fish of the Late Cretaceous and is considered one of the fiercest creatures in the sea. A powerful tail and winglike pectoral fins shot the 17-foot-long (5 ...

But they actually belong to the class Actinopterygii (bony fish), which includes salmon and ... Their flexible tails allow them to anchor themselves to coral or seaweed when they need to rest.