Oxalaia was the second biggest known Spinosaur. It was up to 50 feet long and 8 tons, though some people say it was smaller than that. It lived around 100 million years ago in the middle Cretaceous. It also happened to live in Argentina, which means it lived in the land of giants. The only prey was sauropod, which means that Oxalaia was either a sole fish eater, or the deadliest Spinosaur yet.