Archaeopteryx

The Archaeopteryx is a standalone fossil that can be donated to the museum in and.

Donating Archaeopteryx in Wild World
"Archaeopteryx had wings and looked almost exactly like a modern bird, eh wot? As such, most scientists believed it was the true avian ancestor. Our most recent studies however, conclude that the lineage is not direct. Current hypotheses point to multiple ancestors, some yet to be discovered. Ah! Sorry for running on! This could be one of my ancient relatives, wot!"

Donating Archaeopteryx in City Folk
"Hoo, what a wondrous find! Such perfect condition! Archaeoptryx's feathers... led many people to believe it was the progenitor of the birds, eh wot? Sadly, further evidence indicates it's likely not a direct relation... The current thinking is that we had other ancestors. Different grand-Blathers for me, wot wot! To be honest, there are almost as many theories as fossils for this beastie. It's quite a riddle!"