Blue whales are the most massive animals to exist in the history of animals. Dreadnoughtus and those other thundering, 60-ton dinosaurs? Bantamweights next to one of today's 100-ton Balaenoptera musculus.
"How Did Whales Get So Big? Paleontologists Say They've Figured It Out." is from the May 24, 2017 Health & Science section of The Washington Post. It was written by Ben Guarino and narrated by Sam Scholl.