Plesiosaurus

The Plesiosaur is a three-part fossil that can be donated to the museum in all games to date.

In Animal Crossing
''"At last! At last! Huzzah! The plesiosaur is... complete! I never thought I would live to see this day! It's fantastic! Brilliant! A wonderful, joyful occasion! Delight ripples through my body and soul! But I'm getting carried away. Now then, where shall I begin with these leviathans? The great plesiosaurs... In actuality, plesiosaurs were not dinosaurs, but aquatic reptiles, which ruled the seas during the Mesozoic era. There were two main types of plesiosaurs, both of which had broad bodies, four large flippers, and short tails. The two groups were distinct in that one had long necks and small heads, the other short necks and large heads. The plesiosaurs ranged in size from 2.4 to 14 m long, and their diets consisted of fish and other marine creatures. The first plesiosaur fossil was discovered in 1824, and subsequent findings have been made on every continent. Incredible, eh wot? Indeed! What I wouldn't do to dig one up myself! The thrill! Where in blazes is my shovel? Hoo hoo hoo! Oh, my! I must beg your pardon. The very idea of field work gets my crumpets toasting!"''

In Wild World
"This creature emerged toward the end of the era of the dinosaurs... To be accurate, it was not a dinosaur but rather a type of long-neck reptile. The first plesiosaurus fossil was found 35 years ago by a high-schooler! Amazing! I shan't tell you what MY greatest high-school accomplishment was... Wouldn't it be wonderful to discover a new fossil?! I hope to...someday."

In City Folk
"...Most excellent news! The plesiosaurus has been completed! Hoo my, such a staggering event! The plesiosaurus appeared toward the end of the dinosaurs' days on earth. It was a reptile that lived in the ocean, and it's called "the long-necked dinosaur" in Japanese. Indeed, someone named Suzuki found the first one and named it that... But you see, he was still a high-school student when he discovered the fossils. He quickly became the neighborhood hero, wot!"

In New Leaf
"While not a dinosaur itself, the plesiosaur, a marine reptile, did live alongside the dinosaurs. These creatures could reach lengths of 7 m or longer, the bulk of that being their long necks. Plesiosaurs are commonly mistaken for certain kinds of mythical sea monsters, such as "Nessie.""

In Real Life
The Plesiosaur was a large marine reptile that weighs 450 kg and lived in the early Jurassic period. It was 100cm high and 3.5 m long.