The antibiotic-free pigs roam freely on Niman Ranch in Iowa. Sarah Willis/courtesy Niman Ranch hide caption

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A Tokyo sushi restaurant displays blocks of fat meat tuna cut out from a 269kg bluefin tuna. Yoshikazu Tsuno/AFP/Getty Images hide caption

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Researcher Hans Roy opens a core sample taken from the bottom of the Pacific Ocean. A core sample like this one contained bacteria that settled on the seafloor 86 million years ago. Bo Barker Jorgensen/Science/AAAS hide caption

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Orca L112, also known as Victoria, was 3 years old when she washed up on the Washington coast. An investigation into her death has been inconclusive. Center for Whale Research hide caption

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The calico lobster known as Calvin is shown in this photo provided by Boston's New England Aquarium. The lobster is dark with bright orange and yellow spots. Tony LaCasse/New England Aquarium hide caption

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John Odenkirk holds up a snakehead. The fish can survive for long periods of time out of water as long as they're kept moist. They breathe air by gulping it, so they don't need to stay submerged. Sabri Ben-Achour/for NPR hide caption

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Eight Belles (far left) broke both of her front ankles after finishing second in the 134th Kentucky Derby in May 2008. She was later euthanized. Matthew Stockman/Getty Images hide caption

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On a recent Saturday, the Prothonotary warbler drew crowds of plugged-in bird watchers in New York's Central Park. sydphi via Flickr hide caption

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An illustration of the Chinese Jurassic "pseudo-flea," which lived in the Middle Jurassic in northeastern China. Wang Cheng/Current Biology hide caption

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