Many introduced plants have become naturalized across the continent and some are replacing North American native plant species.

许多引进的物种在整个大陆都已经顺化，一些种类正在取代北美本土植物种类。

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They feed on plants and small animals and, in captivity, on small crustaceans and other foods. They have become naturalized in many parts of the eastern U. S.

杂食性，以植物及小动物为食，在饲养条件下也吃小型甲壳动物，并可用剁碎的蚊类幼虫、谷类和其它食物作为补充饲料。

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