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Arkansaurus measured about 4.6 metres (15 ft) long and weighed about 380.5 kilograms (839 lb). [8] [9] Examination of the holotype consisting of a nearly complete right foot suggests that Arkansaurus was similar to most ornithomimosaurians of the Early Cretaceous, with the strong curvature of the foot claws being the only exception: most ornithomimosaurians had flat claws. [7]
Size is an important aspect of dinosaur paleontology, of interest to both the general public and professional scientists. Dinosaurs show some of the most extreme variations in size of any land animal group, ranging from tiny hummingbirds , which can weigh as little as two grams, to the extinct titanosaurs , such as Argentinosaurus and ...
Original description : A size comparison of four different snakes; comparing large individuals of the extant green anaconda (Eunectes murinus) and reticulated python (Malayopython reticulatus) to total length estimates of the extinct Gigantophis and Titanoboa. • The green anaconda is the largest (most massive) extant snake.
Ornithomimosauria ("bird-mimic lizards") are theropod dinosaurs which bore a superficial resemblance to the modern-day ostrich.They were fast, omnivorous or herbivorous dinosaurs from the Cretaceous Period of Laurasia (now Asia, Europe and North America), as well as possibly Africa.
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This is a list of U.S. state dinosaurs in the United States, including the District of Columbia.Many states also have dinosaurs as state fossils, or designate named avian dinosaurs (List of U.S. state birds), but this list only includes those that have been officially designated as "state dinosaurs".