Tadpole of American bullfrog, Rana catesbeiana. As it transforms into a frog, the tadpole's round mouth, adapted for feeding on plants, will gradually widen and take on a shape more suitable for a predator. Native to the Eastern United States, bullfrogs were introduced and have become established west of the Rockies. Bullfrogs are large, aggressive predators and prolific breeders, and have seriously depleted native frog populations in many areas of the West.
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Copyright © Dan Suzio
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