Tully Monster Mystery

What is an invertebrate?

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An invertebrate is an animal that does not have a backbone or spine, examples can include: insects, crabs, lobsters, snails, octopuses, and worms. Here are some examples of invertebrates from the Field Museum’s collections!

Silurian Cephalopod

Cephalopods are marine invertebrates including squid, octopus, and many others.

Looking at this artist's reconstruction of two cephalopods from the Silurian period over 400 million years ago, do you think any parts of these creatures' bodies are hard? Why or why not?

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