Title: Biblio RTF Export
Author: Biblio 7.x

?Plectropterus gambensis IUCN?, BirdLife International , 2010.

P.  Johnsguard, Handbook of Waterfowl Behavior. Lincoln : University of Nebraska, 1965.

C. R.  Darwin, ?The descent of man, and selection in relation to sex.?, 1871.