Fossils show that whales entered the water before they took a liking to fish.
References
Thewissen, J. G. M., Cooper, L. N., Clementz, M. T., Bajpai, S. & Tiwari, B. N. Nature, 450, 1190?1194, (2007).
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Sanderson, K. The land-based ancestor of whales. Nature (2007). https://doi.org/10.1038/news.2007.388
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DOI: https://doi.org/10.1038/news.2007.388
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