Scientists use different methods to calculate size and weight so they don’t always agree, but judging by bones found, a good guess is possible.

Another titanosaur, found in southwestern Argentina in 1987 was officially titled Argentinosaurus. That one grew up to 40 meters (131 feet) long and weighed more than 110 tons. That's about the ...

A couple of others might have been as big or even bigger. Argentinosaurus has been calculated to be longer and heavier at 30–35 metres and 65–80 tonnes. And Puertasaurus was thought to be around 30 ...