M Watson/Ardea/Caters News
  • Animals Laugh

    A cheery chimpanzee can be seen sporting a toothy grin as he enjoys life at Chimfunshi Wildlife Orphanage in Zambia.
    M Watson/Ardea/Caters News
  • Animals Laughing

    A chuckling cheetah creases up in Kenya.
    Ferrero Labat/Ardea/Caters News
  • Animals Laughing

    An Alpine marmot grins.
    Duncan Usher/Ardea/Caters News
  • Animals Laughing

    A pot-bellied pig is clearly tickled pink at his home in Lower Saxony, Germany.
    Duncan Usher/Ardea/Caters News
  • Animals Laughing

    A bottlenose dolphin is amused and enjoys a good, old giggle.
    A L Stanzani/Ardea/Caters News
  • Animals Laughing

    A snowy owl is joshing around.
    Andrey Zvoznikov/Ardea/Caters News
  • Animals Laughing

    An Icelandic horse appears to be amused when he spots a photographer's camera.
    John Daniels/Ardea/Caters News
  • Animals Laughing

    A Bactrian camel snickers.
    M Watson/Ardea/Caters News
  • Animals Laughing

    A red fox cracks up in hysterics.
    M Watson/Ardea/Caters News
  • Animals Laughing

    A sea otter opens his mouth to laugh.
    Duncan Usher/Ardea/Caters News
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PHOTO: The scene near the finish line of the Boston Marathon is seen in this April 16, 2013 file photo. Inset, suspects Tamerlan and Dzhokhar Tsarnaev are seen. Tamerlan Tsarnaev died after a gunfight with police and Dzhokhar Tsarnaev, was captured.
Elise Amendola/AP Photo; Inset: Lowell Sun, FBI/AP Photo
PHOTO: The first explosion knocked down a runner at the finish line of the 117th Boston Marathon.
John Tlumacki/The Boston Globe via Getty Images
PHOTO: Pulaski Township Police Sgt. Chad Adam seen here in this undated Facebook photo, went undercover as an Amish woman.
Pulaski Township Police Department/Facebook
PHOTO: The Earths shadow is cast over the surface of the moon as a total lunar eclipse is seen though a Magnolia tree top in the sky over Tyler, Texas, April 15, 2014.
Dr. Scott M. Lieberman/AP Photo