GRANTS PASS, Ore. -- In the West Coast marijuana-growing region known as the Emerald Triangle, scientists want to know whether rat poison spread around illegal pot plantations is killing northern spotted owls, a threatened species.
But because it is so rare to find a spotted owl dead in the forest, the scientists will look at an invasive cousin owl that's pushing spotted owls out of their territory.
University of California, Davis, doctoral candidate Mourad Gabriel says that tests are being done on 84 barred owls killed in northwestern California and southeastern Oregon as part of research on whether removing them allows spotted owls to reclaim lost territories.
He said Tuesday that among the first owls tested, about half carried the poison.
The research is funded primarily by the U.S. Fish and Wildlife Service.