Hi Texbirds, Thought this article might be of interest. http://www.theguardian.com/science/grrlscientist/2013/sep/20/birds-birdsong- behaviour-pollution-mercury-pcbs-science Or, here's a tiny url of the article: http://tinyurl.com/ob6uktx Regards, Lori Markoff formerly Austin, now Eugene, OR Edit your Freelists account settings for TEXBIRDS at //www.freelists.org/list/texbirds Reposting of traffic from TEXBIRDS is prohibited without seeking permission from the List Owner