A large long-necked dinosaur with unusually long front legs, making it look like it's reaching upward, famous for being one of the biggest land animals ever to exist.
From Greek 'brachion' (arm) and 'sauros' (lizard), literally 'arm-lizard'. The term references the dinosaur's distinctive long front limbs, which were longer than its hind legs, an unusual feature among dinosaurs.
The brachiosaur had such ridiculously long front legs that it basically looked like it was perpetually reaching for something on the top shelf—and scientists think that's exactly why: it could eat leaves that no other dinosaur could reach, giving it an almost unfair advantage at buffet time in the Jurassic period.
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