Sniffer Eggs and Fossils

I think that finding sniffer eggs in and around fossils in the Overworld creates a nice meaningful connection between the two. Whether that's finding the egg at the center of the fossil in some sort of accessible sack like a chest, (maybe it breaks on access and is no longer available as an item in its own right), or by breaking fossil blocks to obtain an egg based on a chance value. 

I also like the idea of tying the discovery of eggs into Archaeology features. Or discovering a map where fossils lay in the work via Archaeology - much like the treasure and mansion maps. 

Adding a purpose to go after fossils in the Overworld would be worthwhile imho.

Cheers