What reproductive dependency forces the California Red-legged Frog tadpoles to rely on specific water features?

Answer

Their metamorphosis can take up to two years

The tadpoles of *R. draytonii* are known to take a relatively long time to metamorphose, sometimes remaining larval for up to two years, which requires the availability of deep pools that do not dry out.

What reproductive dependency forces the California Red-legged Frog tadpoles to rely on specific water features?
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