Long-Necked Dinos Hung Their Heads

Imagine having a 29-foot neck. You might want to hang your head. So it was with some sauropods in the Late Jurassic, about 150 million years ago. Though paleontologists have long thought the creatures used their necks for tree-top foraging, a new study claims doing so would have been impractical. "It would have required the animal to expend approximately half of its energy intake just to circulate the blood," said Australian evolutionary biologist Roger Seymour.

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