Snakes come in all sizes today, from tiny thread snakes no longer than a pencil to green anacondas that rival small cars in length. You already know the anaconda as one of nature’s heavyweights.

Step into the Late Cretaceous period and meet Argentinosaurus, a colossal titanosaur that may have been the largest land animal to ever live. Discovered in Patagonia, this plant-eating giant stretched ...