Dinosaur size
There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils. Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive titanosaur "Argentinosaurus huinculensis", which is the largest dinosaur known from uncontroversial evidence, estimated to have been and long. Some of the longest sauropods were those with exceptionally long, whip-like tails, such as the "Diplodocus hallorum" (formerly "Seismosaurus") and the 33- to 35-metre-long (108–115 ft) "Supersaurus". The tallest was the "Brachiosaurus".
Compsognathidae
Compsognathids are considered to be among the smallest dinosaurs ever discovered. "Compsognathus longipes" was largely acknowledged to the smallest dinosaur and was around the size of a chicken when fully grown. The specimens found indicate that this species was around 1 m long and weighed 2.5 kg. However, recently other adult dinosaur specimen have now been found that are smaller than Compsognathus, including the dinosaurs "Caenagnathasia", "Microraptor", and "Parvicursor", all of which are estimated to be less than 1m long. Most of these specimen are incomplete, so size determination is still just an estimate.