The earliest of the large bipedal dinosaurs, which had two long crests on the head and occurred in the early Jurassic period.
- There are the dangerous velociraptors, which slash and attack in packs; the towering t-rexes, who would be considered aggressive and loud in any neighborhood; the peaceful, foliage-chewing brachiosauri; the hooting, poison-spitting dilophosauri, and many other prehistoric earthshakers.
Modern Latin, from Greek dilophos 'two-crested' + sauros 'lizard'.
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