In the fossil halls of New York's American Museum of Natural History, visitors take a journey through millennia of life on Earth. In each room, you walk among leviathans of bone. The iconic Tyrannosaurus rex and apatosaurus, followed by ancient mammals—Giant sloths, mastodons and many others. All hulking, all awe-inspiring. But on the fourth floor, starting today, resides a new resident that somehow makes all the others seem small by comparison: the titanosaur.

This specimen, so new it has yet to be named (Titanosaur is the family of dinosaurs it comes from), is one of the largest dinosaurs ever discovered, and one of the largest creatures ever to be displayed in the AMNH. The immense 122-foot-long cast of its skeleton is so long, in fact, that it can't quite fit into the Ira D. Wallach Orientation Center in which it's housed. Its head stretches out of the room, almost ten feet off the floor, cocked sideways and peering down upon all who enter with one eye and a big toothy grin. "Hospitably welcoming visitors," said a smiling museum President Ellen V. Futter at a media preview yesterday.