Ice dams form when heat leaking into attics or roof cavities from the building below, or from attic ductwork, melts the bottom layer of snow on the roof. The melt water runs down the length of the roof to the eaves, where it refreezes, forming a dam and icicles.
.JPG "A large Wild North American colorful turkey fanning his feathers")
.JPG "A male wild turkey strutting his feathers")
.JPG "United States of American red white and blue waving flag")