Scientists Are Stepping Up Efforts in Great Lakes Bird Poisoning Situation

Scientists are stepping up efforts to learn where and how many Great Lakes water birds are getting fatal food poisoning.

The U.S. Geological Survey says around 100 thousand may have died since 2000 from type e-botulism.

Loons and other deep-diving birds appear especially vulnerable.

Researchers in Florida are working to try and trace the birds' movements and pinpoint where they were poisoned.

Experts believe a toxin may be involved that is produced when algae dies.

The toxin moves up the food chain until birds eat contaminated fish and become paralyzed.