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Rather than living on a diet of Achatina , Euglandina prefers to feed on the native species and in some areas like the South Pacific has exterminated the native species . His recent research includes understanding the basic life history of California red-legged frogs and Pacific pond turtles , the impacts of cattle grazing on a community of small mammals in the San Joaquin Valley , and the evolution of monogamy in elephant-shrews ( sengis ) and dassie rats in Namibia ( southwestern Africa ) . Until the mid-19th century the San Francisco Bay Area was a rich and thriving fishery . The Debt Collection Improvement Act of 1996 now allows all agencies to administratively garnish wages . Because there are no recent analyses of populations of Takydromus , our preference is to follow the recommendations of Boulenger ( 1921 ) . Elapids have not yet been examined for these phenomena .