Zebra mussel, quagga mussel, round goby and other invasive species are causing havoc on Lake Michigan. This is causing the food web to become out of balance, and may be causing birds to die. National Park biologist and USGS scientist are trying to figure out what is causing this. Can this mystery be solved before the endangered great lakes piping plover becomes extinct? People can help, clean drain and dry all boating and fishing gear to stop aquatic hitch hikers.