>a large predator (Nile Bass?)<

The Nile perch, an obvious bad idea to anyone familiar with trophic patterns (for fishery impact) or with the effects of introduced generalist predators.

There are self-reproducing hybrid populations; these qualify as new species.  Molluscan examples include almost all freshwater Corbicula, most if not all sphaerioideans, and most populations of Lasaea; probably some thiarids also fall under this category.  They are quite common in plants and sporadic but widespread in animals (no mammal or bird examples known, though).  Most animals in this category are parthenogenetic, though Corbicula has some components of sexual reproduction despite being triploid.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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