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(Raul Martin)

The Prehistoric Giants Hall of Fame

What were the largest species of all time? Does the Tyrannosaurus rex make the list?

Largest ammonite

Largest ammonite
(Flickr user muzina_shanghai)
The coil-shelled, aquatic creatures called ammonites left their distinctive fossils behind in abundance. Of the many species known, the biggest may have been one of the last. Parapuzosia seppenradensis, an ammonite discovered in roughly 80-million-year-old rock layers in Germany, had a shell about six and a half feet across.

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