In this 2012 photo provided by the Center for Whale Research, a dog trained to sniff for orca scat sits on a boat in the Salish Sea in Washington state. A new study released Thursday, June 29, 2017 says that the small population of endangered Puget Sound orcas hasn't been successful at giving birth because they're not getting enough salmon to eat. (Photo by Center for Whale Research via AP Photo)
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