Spinosaurus

The Spinosaurus is a three-part fossil that can be donated by the player to the museum in and.

In New Leaf
"The spinosaurus is famous for the sail on its back, made up of skin stretched over spikelike bones. The assumption is that these sails were used to help regulate body temperature, common for reptiles. In addition to having this large sail, it is also the largest of the carnivorous dinosaurs. Despite being so commanding, its diet most likely consisted of fish from swampy, marshy regions."

In New Horizons
"Ahem. Yes. The Spinosaurus was a very large, carnivorous dinosaur, roughly the size of a T. Rex. Unlike its more famous cousin, however, Spinosaurus seems to have spent a great deal of time in water. Similar to modern crocodiles, this creature lived on a diet of fish AND land-dwelling animals. Personally, I am simply relieved that it did not seek FLYING prey."

In Real Life
Spinosaurus lived in North Africa in the middle of the Cretaceous period, about 112 to 93.5 million years ago. It is one of the largest theropods known, at 12.6 to 14.3 meters long and weighing 12 to 20.9 tonnes. First described in 1912, the type specimen was destroyed in 1944 during World War II, when Allied forces bombed Munich, where the specimen was stored. While partial remains were found afterwards, very little was known about the dinosaur until 2014, when a near-complete sub-adult was excavated from the Kem Kem Beds in Morocco. From this discovery, it was revealed that Spinosaurus was the first known non-avian semi-aquatic theropod. It lived in what is sometimes called the "River of Giants", a large river that stretched across northern Africa and was home to an unusually high concentration of carnivores and piscivores. Spinosaurus ate both land animals and fish, although it is debated which comprised a larger portion of its diet.