Unearthed in southern Poland in 2023, the fossil is the first Mastodonsaurus skeleton to be found in such a well-preserved, nearly complete state, according to Warsaw’s Copernicus Science Center, which is hosting the citizen science project. The Mastodonsaurus populated the earth’s waters after the largest known mass extinction and while the first dinosaurs appeared, its story potentially holding information about how life on our planet recovered and transformed after catastrophe.