Anomalocaris

The Anomalocaris is a stand-alone fossil that can be donated to the museum in.

In New Horizons
"Anomalocaris lived in the water long before the dinosaurs and are known for their, er, "distinctive" look. Flat bodies over three feet in length, bulging eyes like a... dragonfly, antennae like shrimp tails... They looked so peculiar that people originally thought they were multiple fossils stacked on top of each other! As a delightful side note, "anomalocaris" means "abnormal shrimp." Obviously this animal has a certain reputation in the scientific community!" –Blathers