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What makes a mammal? Is an octopus a mammal? - Morgridge Institute for Research

What makes a mammal? Is an octopus a mammal? - Morgridge Institute for Research

It’s a great guess, but an octopus is not a mammal. An octopus is an invertebrate animal, which means it has no spine. More specifically, an octopus is a cephalopod, like squid and cuttlefish. They’re some of the smartest invertebrates.

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