Today, the largest land animal in North America is the bison , which can clock in at nearly 4 meters (13 feet) in length, and weigh as much as two grand pianos. But as much as we love bison, they pale in comparison to the biggest terrestrial animal ever to have roamed the continent: Alamosaurus . The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Part of the aptly named titanosaurs – a group of ridiculously gigantic and long-necked sauropod dinosaurs – this enormous lizard is estimated to have been a whopping 21 meters (70 feet) long, and though it’s difficult to determine just how heavy something was based on fossils, the higher end of the estimation scale puts it at up to 80 tons . That’s about 40 times as heavy as today’s lof

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