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When it comes to spotting prey, sharks and rays have a sense beyond sight and smell.
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How does a group of animals - or cells - work together when no one's in charge?
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Some corals look like undersea gardens, gently blowing in the breeze.
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Within seconds of rainfall, dried-up moss is revived after being dead for decades.
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Ants use leaves to grow white tufts of nutritious fungus to feed their offspring.
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Scientists have used a high-speed camera to film hummingbirds' aerial acrobatics.
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Every winter, California newts leave the safety of their forest burrows.
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Most plankton are tiny drifters, wandering in a vast ocean.
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Beneath the towering redwoods lives one of the most peculiar creatures in California.
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Every one of us started out as an embryo.
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Artificial light makes the modern world possible.
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Sea otters aren't just cute -- they're a vivid example of life on the edge.