zoos zoos

The New England Aquarium traded 800 mackerel for 12 puffins. OnceAndFutureLaura/Flickr hide caption

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OnceAndFutureLaura/Flickr

A Dozen Puffins Will Get You 800 Mackerel: Inside The Weird Economy Of Zoos

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This concept image shows an aerial view of the proposed Zootopia in Denmark. The designer says the idea is to let the animals roam free, separated from visitors by hidden barriers. Bjarke Ingels Group hide caption

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Bjarke Ingels Group

Glass-Free Menagerie: New Zoo Concept Gets Rid Of Enclosures

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Arturo, the only polar bear in Argentina, lives in captivity at a zoo in Mendoza. The plight of the "sad bear" has spawned more than 400,000 signatures on a petition to get him moved to a "better life" in Canada. AFP/Getty Images hide caption

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AFP/Getty Images

Veterinarian Vint Virga says that animals in zoos, like this lion, need to have a bit of control over their environment. iStockphoto hide caption

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iStockphoto

Cat PDA Vs. Human PDA, And Other Animal Behavior Explained

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Arturo, the only polar bear in Argentina, lives in captivity at a zoo in Mendoza. The plight of the "sad bear" has spawned more than 400,000 signatures on a petition to get him moved to a "better life" in Canada. AFP/Getty Images hide caption

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AFP/Getty Images

A curious cuttlefish stares back at the camera from inside The Smithsonian's National Zoo Invertebrate Exhibit. The exhibit, home to dozens of small aquatic and terrestrial species without backbones, closed on Sunday. Meghan Murphy/Smithsonian's National Zoo hide caption

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Meghan Murphy/Smithsonian's National Zoo

After several news outlets reported that a man dressed as a gorilla was shot with a tranquilizer gun, a zoo in Tenerife, Spain, wants to be clear: There was no gorilla suit involved. Richard Thomas/iStockphoto hide caption

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Richard Thomas/iStockphoto

The lions at the Copenhagen Zoo eat the remains of a healthy young giraffe named Marius in February. It's unclear whether the lion pictured was one of those euthanized. Kasper Palsnov/AFP/Getty Images hide caption

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Kasper Palsnov/AFP/Getty Images