The second table summarizes general trends of pollution-related declines and abnormalities in the wildlife kingdom. Many of these declines of bird, fish, reptile and mammal populations are correlated to exposures to pollutants capable of disrupting endocrine functions. Chemicals frequently blamed include PCBs, DDT and dioxins. Nevertheless, definitive links between specific chemicals and many wildlife maladies have not been proven because animals are exposed to so many chemicals. For example, alligators in Florida's Lake Apopka don't reproduce well.
Males have abnormally small phalluses.
Around the Great Lakes, bald eagle reproduction is low and an unusual number of baby eagles are born with crossed beaks. The parent eagles' diet of PCB-contaminated fish and birds appears to be the cause. In other cases, combinations of pollutants in the food chain appear responsible. Beluga whales in the St. Lawrence River, swimming in the toxic chemicals discharged from the Great Lakes and from Quebec rivers, are vanishing. They suffer from tumors and a variety of health ailments.