In her book, Silent Spring, Rachel Carson wrote about a chain of events that ended in tragedy for robins. It all started when people wanted to protect American elm trees from a deadly disease. They sprayed the elm trees with an insecticide that contained a powerful chemical called DDT. The chemical pesticides ended up killing backyard robins, but long after the elm trees were sprayed. How did this happen?

Read about Carson's courage to voice her concerns.  A Food Chain Mystery: From Elm Leaves to a Silent Spring Introduction | Article | Journal Page