When I visited the whales exhibit at the Museum of Natural History in New York, 3 years ago or so, they showed that early whales were kind of like alligators, s

When I visited the whales exhibit at the Museum of Natural History in New York, 3 years ago or so, they showed that early whales were kind of like alligators, so I'm not sure why this is a new discovery. Perhaps it just firms up the timeline for when their feeding mechanism changed, or maybe there's some other detail that's escaping me here.