Every spring, adult midge flies emerge by the Milwaukee lakefront in giant swarms to mate, procreate and lay their eggs in Lake Michigan. Though they may be a nuisance, midges play an important role in the ecosystem in and around Lake Michigan; the larvae are a valuable food source for fish and other aquatic organisms in the water and once above water, the adult midge flies can be food for birds, bats and other vertebrates. Read the full story by the Milwaukee Journal Sentinel.