Here is more evidence that illegal marijuana plantations on national forest land leads to significant problems to wildlife:

In the West Coast marijuana-growing region known as the Emerald Triangle, scientists want to know whether the 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, they will be looking at an invasive cousin owl from the East that has been pushing spotted owls out of their territory since the 1990s.

Mourad Gabriel, a doctoral candidate at the University of California at Davis Veterinary Genetics Laboratory, said Tuesday they are testing 84 barred owls from Northern California killed in the course of research on whether removing them allows spotted owls to reclaim lost territories. Those owls were collected primarily by the California Academy of Sciences and Green Diamond Resource Company, which grows redwood for timber.

Among the first roughly 10 barred owls tested, about half have been positive for the poison. Two spotted owls found dead in Mendocino County in Northern California also tested positive for the poisons, Gabriel said.