Amargasaurus (encyclopedia entry)

Weighing 3–5 tons (6,600–11,000 lbs), Amargasaurus is considerably smaller than some of its better-known sauropod cousins, such as Apatosaurus and Brachiosaurus. Amargasaurus, however, has an important distinguishing feature that has baffled scientists since its discovery.  Amargasaurus has peculiar elongated spines that protrude from the animal’s vertebrae, which are up to 50 cm (21 inches) long […]

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