A lot of people don't realize the Mute Swan is an invasive species to North America http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Cygn

A lot of people don't realize the Mute Swan is an invasive species to North America http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Cygnus_olor.html#Introduction_Facts http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/in...