From tiny puddle-dwelling creatures that can survive in outer space to a paint so dark that your eyes can't actually even see it, the Earth is filled with plenty of strange and incredible things.
Meet the weird, wacky and wonderful creatures that lived in Cambrian seas over 500 million years ago
The Cambrian sea was a very strange and alien place ... set the stage for all animal life on Earth, including us. Watch First Animals on The Nature of Things.
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