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| Description: Guppies are native to the streams and rivers of Trinidad and Tobago, islands in the southeastern Caribbean, and in the rivers draining nearby parts of the South American mainland. The waters inhabited by guppies range from small clear mountain streams to murky lowland rivers. Along this gradient of physical conditions, guppies also encounter a broad range of biological situations. In the headwaters of streams above waterfalls, guppies live in the absence of predaceous fish or with the killifish Rivulus hartii, which preys mainly on juveniles and is not a very effective predator on adult guppies. In contrast, guppies in lowland rivers live with a wide variety of predaceous fish, including the pike cichlid, Crenicichla alta, a very effective visual predator of adult guppies.
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