(CNN) - There could be a silent killer lurking in your home: your cat.
Researchers at the University of Georgia say that 44 percent of roaming cats hunt wildlife and on average make two kills a week.
While that might not seem like a lot, it really adds up considering people in the U.S. own an estimated 86 million cats, according to the American Pet Products Association.
The American Bird Conservancy told USA Today those predator cats are wiping out the bird population.
The Conservancy's president says one in three American bird species is in decline and he blames felines.
The study's researchers worked with the National Geographic CritterCam team, putting video cameras on the collars of cats and then let them roam.