The largest known sauropods were almost 100 tons and 40 meters long, ~100 million years ago. e.g. https://en.wikipedia.org/wiki/Argentinosaurus https://en.wikip

The largest known sauropods were almost 100 tons and 40 meters long, ~100 million years ago. e.g. https://en.wikipedia.org/wiki/Argentinosaurus https://en.wikipedia.org/wiki/Argentinosaurus For comparison the largest blue whales are up to ~180 tons and 30 meters long, and the largest elephants are ~12 tons and 6 meters long (some prehistoric elephants may have gotten up to 22 tons).