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A mysterious, ancient organism with leaf-like fronds once flourished in shallow waters. Now, fossils suggest they were animals. If true, the animal in question would be among the first to exist, dating back at least 571 million years, which is about 30 million years before the so-called Cambrian explosion, when many of today's animal groups first burst onto the scene. The mysterious frond fossils have been found around the world. The fossilized imprints suggest that the organisms were soft and squishy and that some sported fronds that branched outward like seaweed. The findings suggest that some theories on animal evolution may need to be revised.
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