remains, so the size estimates are uncertain. Length is calculated by comparing existing bones to the bones of similar dinosaurs, which are known from more complete skeletons and scaling them up isometrically. However, such extrapolation can never be more than an educated guess and the length of the tail, in particular, is often hard to judge. Determining mass is even more difficult because little evidence of soft tissues survives in the fossil record. In addition, isometric scaling is based on the assumption that body proportions remain the same, which is not necessarily the case. In particular, the proportions of the titanosaurs are not well known, due to a limited number of relatively complete specimens. If the upper size estimates for Bruhathkayosaurus are accurate, it would be similar in size to the blue whale. Mature blue whales can reach in length, and the record-holder blue whale was recorded at , with estimates of up to . Another poorly known sauropod that shares similar size estimates to Bruhathkayosaurus is Maraapunisaurus fragillimus, which is based on a now-missing dorsal vertebra. In 2006, Kenneth Carpenter used Diplodocus as a guide and estimated Maraapunisaurus to be in length and weigh only about . In 2018, however, Carpenter estimated Maraapunisaurus to be in length based upon comparisons with rebbachisaurids. In 2019, Paul gave a higher estimation of and a weight of . See also Largest prehistoric animals Dinosaur size Breviparopus Patagotitan References External links Report on the initial description from the Dinosaur Mailing List Titanosaurs Maastrichtian life Late Cretaceous dinosaurs Dinosaurs of India and Madagascar Fossils of India Fossil taxa described in 1987 Controversial dinosaur taxa