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9. Argentinosaurus (and all titanosaurs)

An Argentinosaurus skeleton. Big!
An Argentinosaurus skeleton. Big! Photo: Wikimedia Commons

It’s difficult to say whether Argentinosaurus or Patagotitan was the largest-known land animal of all time, but the titanosaurs definitely deserve a place on this list. The massive herbivorous sauropods lived until the Late Cretaceous, and the largest individuals may have weighed over 100 tons (elephants typically weigh around 6 tons).

Any list that overlooks the largest animals—with necks so long that the tallest individuals would be able to peer into windows seven stories up—is falling short. You can’t help but wonder how many Deinonychus it would take to bring down one massive sauropod.