Diplodocus

The Diplodocus is a five-part fossil that can be donated to the museum in and.

In New Leaf
"The diplodocus was a herbivore of the late Jurassic period sporting a tremendously long tail and neck. The neck was so long that, from snout to tail, its length could reach a staggering 175 feet long. Evidence suggests it would use its long, slender tail like a whip to defend itself from attackers."

In New Horizons
"Good old Diplodocus—what would we do without you? This stout fellow embodied all the best in dinosaurs. Those sturdy legs, that magnificent tail, and, above all, that extraordinary neck! Did you know that its center of gravity was such that sitting up on its hind legs was probably easy? What's more, paired with its long neck, this ability greatly increased its reach for eating plants! Best of all, Diplodocus probably grew its entire life, having no 'adult size.' Would that we were all so gifted!"

In real life
The diploducus had a long neck and lived 162 million years ago. It was a herbivore and could not actually chew.