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In Peru‘s Amazon, A 16-Myr-Old Fossil Of Pebanista Yacuruna (PY), The Largest Freshwater Dolphin (FWD), Was Found. ~3.5m Long, It’s ~25% Larger Than Modern FWD. PY Is Said To Be Related To The Modern South Asia FWD. PY Extinction May Be Linked To Ancient Amazon Lake Drainage. This Find Highlights FWD Evolution And Ecosystem Vulnerability.

Ancient giant dolphin discovered in the Amazon | CNN

https://www.cnn.com/2024/03/26/world/giant-dolphin-fossil-amazon-pebanista-yacuruna-scn/index.html#:~:text=Analysis%20of%20the%20newly%20identified,the%20biggest%20known%20freshwater%20dolphin.

A newly identified ancient skull found in Peru has revealed an extinct giant called Pebanista yacuruna that offers insight into the evolution of freshwater dolphins.