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Have you seen Environment and Climate Change's tree swallow boxes along the river? This year is our last year of monitoring. Tree swallows feed on insects that emerge from the sediment at the bottom of the river, where they may be exposed to toxic chemicals such as PCBs, mercury and PAHs. By analyzing the eggs and plasma of tree swallows, researchers can determine if contaminants are adversely affecting reproduction. More ➡️ tinyurl.com/drres1
