The main result of the experiments with two groups of California garter snakes that varied in habitat and food was:

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Inland populations were aquatic and commonly fed underwater on frogs and fish.Coastal populations were terrestrial and fed mainly on slugs.In the laboratory,inland adult snakes refused to eat slugs while coastal populations readily did so.Matings between the two populations resulted in offspring with an intermediate incidence of slug acceptance.

The Main Result of the Experiments with Two Groups of California