Call it a UFO: an unidentified floating object. Beachcombers were baffled over a creepy, “skeleton-like” figure with fins that washed ashore in the UK, as seen in viral photos making waves online.

Sturgeons are one of the oldest groups of fishes. Sporting an armor of five rows of bony, modified scales called dermal ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Despite their survival through several geological time periods, many present-day ...

Despite their survival through several geological time periods, many present-day sturgeon species are at threat of extinction, with 17 of 27 species listed as “critically endangered.” ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Natalia Przelomska, Smithsonian Institution and Logan Kistler, Smithsonian ...