Coprolite

The Coprolite is a stand-alone fossil that can be donated to the museum in, and. The fossil was changed from its descriptive name, Dino Droppings, when it was brought into City Folk.

Donating Coprolite in Wild World
"Hoo my, THIS is impressive! This fossil is in absolutely impeccable shape, wot wot! Dino droppings are a veritable treasure chest of information. For one thing, you can tell what the ancient little beasty ate! This was an herbivore, wot? As such, its... waste... will contain many small rocks... And why? Because this particular beast swallowed rocks with its plants! The rocks ground food up in its belly to aid with digestion... Amazing, wot? Oh! I'm terribly sorry. The very thought of belly pebbles gets me agitated!"

Donating Coprolite in City Folk
"Hoo, absolutely smashing! A fantastic find! These coprolites are treasure troves of information, eh wot? For example, there are little stones mixed in with the droppings of some herbivorous dinosaurs. Indeed, they would swallow plants and stones, which, mashing together in their stomachs, digested food. We can learn not just what they ate, but also HOW they ate! Hootie poo!"

Museum description from New Leaf
[Coprolite] "Fossilized dung might not sound too exciting, but coprolites are a treasure trove of information. If they contain seeds, bones, or scales, you can gain insight into the animal's natural diet. Dung doesn't easily turn into fossils, so they're considered quite precious and hard to come by."