“Hybridization of an abundant species with a less abundant and declining one can lead to genetic extinction of the species with the smaller population” write Longcore et al. (2000). When I was young, that scenario was playing out for the American Black Duck. Mallards were becoming abundant and hybridized with Black Ducks. The Black Ducks were over-hunted as their northeastern North American breeding range was degraded. But, thanks to the Black Duck’s wide range and to stringent hunting regulations, this species appears to be on the rebound.