UNSPECIFIED - MARCH 03: Smooth-coated otter (Lutra perspicillata or Lutrogale perspicillata), Mustelidae. (Photo by DeAgostini/Getty Images)
AMAZON FISHING: Rare giant river otters on the Ventuari River in the Amazon region of Venezuela December 12, 1998. The Amazon has become a dream destination for hard-core anglers spending thousands of dollars on special fishing safari's. (photo by Tim Chapman)
A river otter, left, eyes a bird Thursday, Jan. 3, 2013, in San Francisco. For the first time in decades, a river otter has made San Francisco its home, taking up residence in the ruins of the Sutro baths, a 19th century seaside pond facing the Pacific Ocean. (AP Photo/Ben Margot)
In this May 8, 2012 photo provided the Wildlife Conservation Society, three North American river otter pups huddle together at the Prospect Park Zoo in New York. The trio were born in February at the zoo in February and according to the Wildlife Conservation Society, who manages the zoo, are the first North American river otters born in a New York City zoo or aquarium since 1956. (AP Photo/Wildlife Conservation Society, Julie Larsen Maher)
Two river otters swim at the Stone Zoo in Stoneham, Mass., Monday, Oct. 8, 2007. (AP Photo/William B. Plowman)
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MACHIAS, Wash. (AP) -- A river otter attacked an 8-year-old boy and his grandmother as they were swimming in the Pilchuck River at a park in the Snohomish County town of Machias (muh-CHEYE'-us).
The boy's mother, Tabitha Moser, told KING that she saw the 4-foot otter attack her son Thursday morning at Lake Connor Park. She says her mother saved him.
The grandmother was treated at Harborview Medical Center in Seattle and the boy at Providence Medical Center in Everett.
Moser says she heard her son screaming and saw the otter on top of his head. She says the otter continued to bite her mother as they left the water.
Moser says the otter stood on its hind legs and looked at them as if to say, "Don't come in here."