Patagotitan mayorum is estimated to have been about 77 tons (70 metric tonnes) and 122 feet (37.2 meters) long, which would make it the largest dinosaur we know of.

The next time a 4-year-old asks what the biggest dinosaur ever was, you can respond confidently: It was the titanosaur Patagotitan mayorum (simply "Patagotitan" for short), a colossal creature that ...