U.S. Department of Agriculture/Wenatchee Police Department Composite

False alarm in the ongoing manhunt for suspected killer Travis Decker ... the feds say bones found near where his dead daughters' bodies were discovered turned out to be from an animal.

The FBI says Central Washington University examined the bones and determined they are not from a human. FBI

As we reported ... the FBI said last week they found bones near the Leavenworth, WA campground where Decker's daughters -- Paityn , 9; Evelyn , 8; and Olivia , 5 -- were found dead .

Decker is the main suspect in the girls' deaths ... his DNA -- and only his DNA -- was found on the plastic bags covering his late children's heads . The county medical examiner ruled they died by suffocation and their deaths w

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