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ย This is the Mary River turtle (Elusor macrurus), and its green mohawk is made up of algae. This often covers the shell as well as the head, and helps to camouflage the animal.

Is this symbiosis? If so, should we consider this turtle as being part-algea? (Though I guess weโ€™re then largely bacteria, considering how much we have 10x as many bacterial cells inside us than human cells!)

Also, this photo is awesome.

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