Artist rendering of Nyasasaurus parringtoni, either the earliest dinosaur or the closest dinosaur relative yet discovered. Nyasasaurus parringtoni was up to 10 feet long, weighed perhaps 135 pounds and is depicted near plant-eating reptiles of the genus Stenaulorhynchus.
The humerus, or upper arm bone, of Nyasasaurus parringtoni next to a cross section of the bone. The many colors indicate that the bone fibers are disorganized, much like those of early dinosaurs.
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