How does D.D.T. affect birds?

Dichlorodiphenyltrichloroethane (D.D.T.) is a synthetic pesticide that has significant negative effects on bird populations. It causes eggshell thinning, which leads to decreased reproductive success as eggs become more susceptible to breaking. Additionally, D.D.T. can accumulate in the food chain, resulting in toxicity and behavioral changes in birds. The widespread use of D.D.T. contributed to the decline of several bird species, particularly raptors and other predatory birds.