jan 18, 68 BC - A freshwater species of dolphin named the Baiji went extinct around this time and never coexisted with dinosaurs.
Description:
http://www.hummingbirds.arizona.edu/courses/Ecol206/Turvey%20et%20al.%202007%20Human-caused%20extinction%20of%20a%20cetacean%20species.pdf
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Courtney Ha timeline
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