0250 Ammonites are complex mollusks

These are fossils. What's an ammonite? Any of various marine mollusks of the class Cephalopoda, such as the octopus, squid, cuttlefish, or nautilus, having a large head, large eyes, prehensile tentacles, and, in most species, an ink sac containing a dark fluid used for protection or defense. They lived between 65 million and 145 million years ago.

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