@article {2219,
	title = {Plectropterus gambensis IUCN},
	year = {2010},
	institution = {BirdLife International }
}
@book {2218,
	title = {Handbook of Waterfowl Behavior},
	year = {1965},
	publisher = {University of Nebraska},
	organization = {University of Nebraska},
	address = {Lincoln },
	url = {http://digitalcommons.unl.edu/bioscihandwaterfowl/7},
	author = {Johnsguard, Paul}
}
@book {2208,
	title = {Mute Swan (Cygnus olor). In The Birds of North America No 273 },
	year = {1997},
	publisher = {The Birds of North America, Inc.},
	organization = {The Birds of North America, Inc.},
	edition = {No. 273 (A.Poole and F. Gill) },
	address = {Philadelphia, PA},
	author = {Ciaranca, M. A. and Allin, CC and Jones, GS}
}
@book {2207,
	title = {The descent of man, and selection in relation to sex.},
	year = {1871},
	author = {Darwin, C. R.}
}
@book {2201,
	title = {Common Merganser (Mergus merganser) in The Birds of North America, No. 442},
	series = {The Birds of North America },
	year = {1999},
	publisher = {The Birds of North America, Inc. },
	organization = {The Birds of North America, Inc. },
	address = {Philadelphia, PA },
	author = {Mallory, M and Metz, K},
	editor = {Poole, A and Gill, F}
}
@inbook {2200,
	title = {The descent of man, and selection in relation to sex.},
	year = {1871},
	author = {Darwin, C. R.}
}
@article {2198,
	title = {Paradise Duck/ putakitaki/ putangitangi },
	year = {2006},
	institution = {Canterbury Conservancy },
	address = {Christchurch},
	author = {Lowres}
}
@book {2197,
	title = {The descent of man, and selection in relation to sex.},
	volume = {Volume 2 },
	year = {1871},
	publisher = {John Murray},
	organization = {John Murray},
	address = {London},
	author = {Darwin, C. R.}
}
