Cuttlefish (Sweet Square #8)
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| © 2012 Sylvia Liu |
Cuttlefish are less well known than other cephalopods, but just as interesting:
- Their blood is greenish-blue because it uses a copper-containing protein, hemocyanin, to carry oxygen instead of the red iron-containing protein hemoglobin we're familiar with.
- They are masters of disguise because they can rapidly change skin colors to camouflage themselves.
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