@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}
}
@inbook {2200,
	title = {The descent of man, and selection in relation to sex.},
	year = {1871},
	author = {Darwin, C. R.}
}
