Patagotitan

Máximo, Patagotitan mayorum, filling Stanley Field Hall at the Field Museum in Chicago, the hall SUE left in 2018. Every bone here is a cast or a sculpted piece, and that is the only way to show it whole: the species is known from around 130 fossil bones, and no complete skeleton has been found. The American Museum of Natural History in New York shows its own cast of the same titanosaur, 122 feet long. Either one gives the true scale of one of the biggest animals that ever walked.