Wild Things: Life as We Know It

Vanishing dinosaurs, breeding birds, redback spiders and more

(Tim Wimborne / Reuters / Corbis)

Dinosaur Species Vanish!

dinosaure species
(Cheryl Carlin)
The dinosaurs above have been considered three species. But a new analysis of fossil skulls led by the University of Montana suggests they're different life stages of P. wyomingensis, whose horns disappear and dome head grows over time. The find fuels speculation that up to a third of recognized dinosaur species are in fact juvenile forms of other species.

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