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<em>Elysia chlorotica</em> is a photosynthetic slug that uses chloroplasts from the algae it eats to make energy from sunlight. Photo: <a href="http://en.wikipedia.org/wiki/File:Elysia_chlorotica_%281%29.jpg">Patrick Krug</a>, Cataloging Diversity in the Sacoglossa LifeDesk
Elysia chlorotica is a photosynthetic slug that uses chloroplasts from the algae it eats to make energy from sunlight. Photo: Patrick Krug, Cataloging Diversity in the Sacoglossa LifeDesk

Natural Selections: "Alternative" animals

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In general, plants make food from sunlight, and animals fuel themselves by "burning" oxygen. But some animals think outside the box.

Curt stager and Martha Foley look at a photosynthetic slug that hijacks the genetic machinery of the algae in its diet, and at a jellyfish that needs no oxygen, burning the alternative fuels of hydrogen and sulphur.

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