Need to know more. “mute swans have often inspired positive thoughts from Americans who know little about the consequences of having them in the wild. But given the real-world ecological problems this exotic (non-native) species has caused for native waterfowl, it's apparent to most wildlife enthusiasts that America would be better off without it.” http://www.pgc.state.pa.us/pgc/cwp/view.asp?a =468&q=151812
Hungry swan greatest concerns is that mute swans can and do severely disrupt natural food chains, because their large appetites and year-round presence put tremendous pressure on aquatic vegetation resources. http://www.pgc.state.pa.us/pgc/cwp/view.asp?a=468&q=151812
Sex difference Sexes look alike, male slightly larger and with larger knob on bill. http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Mute_Swan.html#description
Conservation Status Its aggressive nature can disrupt the nesting of native waterfowl. It is protected in some states, but not others. Some states are attempting to control Mute Swan numbers. http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Mute_Swan.html#description
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