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Scientists will probably never be certain of the largest and smallest dinosaurs to have ever existed. This is because only a tiny percentage of animals ever fossilize, and most of these remain buried in the earth. Few of the specimens that are recovered are complete skeletons, and impressions of skin and other soft tissues are rare. Rebuilding a complete skeleton by comparing the size and morphology of bones to those of similar, better-known species is an inexact art, and reconstructing the muscles and other organs of the living animal is, at best, a process of educated guesswork.
The tallest and heaviest dinosaur known from good skeletons is "Giraffatitan brancai" (previously classified as a species of "Brachiosaurus"). Its remains were discovered in Tanzania between 1907 and 1912. Bones from several similar-sized individuals were incorporated into the skeleton now mounted and on display at the Museum für Naturkunde Berlin; this mount is tall and long, and would have belonged to an animal that weighed between and  kilograms ( and  lb). The longest complete dinosaur is the long "Diplodocus", which was discovered in Wyoming in the United States and displayed in Pittsburgh's Carnegie Natural History Museum in 1907. The longest dinosaur known from good fossil material is the "Patagotitan": the skeleton mount in the American Museum of Natural History is long. The Carmen Funes Museum has an "Argentinosaurus" reconstructed skeleton mount long.
Giraffatitan brancai