Dr. Kelly Diehl talks with Dr. Jordan Karubian, Associate Professor at Tulane University’s Department of Ecology and Evolutionary Biology, about his latest study, which found that mockingbirds exposed to sub-lethal levels of lead in urban areas display heightened aggression. He says the findings highlight the possibility that sub-lethal lead exposure may be common among other wildlife living in urban areas and more work is needed to better understand its full effects.