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A bull shark's ability to prey on many different species is helped by its capacity to survive in both freshwater and saltwater.
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Swinging for Bull Sharks

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One-meter-tall plastic drifters are released into the Gulf of Mexico in 2012. Over 300 of these drifters were released and their location information was sent to researchers every five minutes through GPS satellite.
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Deploying GLAD Drifters

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plastic bottles, cans, a yellow hard hat, and other human refuse litters a tropical beach
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Bring Your Own Container to Avoid Trash

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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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It took a while for scientists to identify what made this spiral track.
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Spiral Track on Ocean Floor

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The mauve stinger is a glowing jellyfish.
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Glowing Mauve

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The deepest point on earth is the Mariana Trench.
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Mariana Trench

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The Japanese spider crab may be big but it is not invincible.
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Japanese Spider Crab

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There are many techniques used to sample the benthic zone.
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Benthic Diving Techniques

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A thresher shark uses its unusual tail fin for swimming and hunting.
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The Thrashing Thresher Shark

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A photo of a sea walnut, a ctenophore.
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Sea Walnut (Mnemiopsis leidyi)

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