OK this is just too weird. Songbirds are contaminated with mercury near a river in Virgina where the fish are too mercury-contaminated to eat. But the birds don't eat from the river. What gives?
Oh, it's the spiders. The mercury-laden songbirds are getting it from mercury-contaminated spiders. Nobody knows yet how how the spiders are getting the mercury. Unless the spiders are eating the mercury-contaminated fish. What a tangled web of pollution, and the first known instance of mercury from fish infiltrating a purely land-based ecosystem (spiders and songbirds).