Ammonites are the most widely known fossil;Read More
Ammonite fossils are found on every continent. And come in every naturally occurring color. Ammonites began life very tiny, less then 1mm in diameter, and were vulnerable to attack from predators. They fed on plankton and quickly assumed a strong protective outer shell. They also grew quickly with the females growing up to 400% larger then the males; because they needed the larger shell for egg production. Most ammonites only lived for two years. Some lived longer becoming very large.
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