The Portuguese man o' war (Physalia physalis) is the most famous and spectacular member of the Blue Fleet. Questions to be asked and answered: What is the Blue Fleet? What obscure connection does it have to the Aquatic Ape theory of human evolution? Just how insanely weird is the Portuguese man o' war anyway, and what strange connection does it have to another member of the Blue Fleet – the improbably beautiful sea swallow, a ferociously predatory sea slug?

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Intro and outro music by Audionautix. Other music in this episode by Kai Engel , Jacopo Tore and Josh Woodward. All licensed under Creative Commons Attribution.

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