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«It took us quite some time to come to the realization that these large teeth were framing narrow slots for filter feeding.» (sciencedaily.com)
Pegging the trend toward giant sizes to the Plio - Pleistocene ruled out other hypotheses such as the threat of predation by the huge shark megalodon — which had already been around for millions of years before the whales» growth spurt — or the advent of filter feeding, which had been around for more than 15 million years at that point. (scientificamerican.com)