Coprolite

The Coprolite (known as the Dino Droppings in ) is a standalone fossil in the introduced in  that appears in all subsequent games.

In
When donating to Blathers in, he will provide the following information about the fossil:

"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!"

In
When donating to Blathers in, he will provide the following information about the fossil:

"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!"

In
After donating the fossil in, its plaque in the museum will read:

"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."