Diplodocids were a family of dinosaurs with long necks and, often, even longer tails — some species’ tails reached 50 feet in length. They were wide-ranging, but especially flourished in what’s now the western US around 152 million years ago.

(SOURCE) https://www.cnn.com/2022/12/16/world/dinosaur-tail-whips-sonic-boom-scn/index.html