Wildlife agencies rescued the species after the 2020 Bobcat Fire threatened the streams where they live.
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Over the past two years, 125 frogs were being raised at the Aquarium of the Pacific in Long Beach.
More than 100 tadpoles hatched at the Los Angeles Zoo last year.
Experts learned from previous releases that the best time to set them free is when they have changed from tadpoles to froglets.
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These frogs are native to the San Gabriel, San Bernardino and San Jacinto Mountains.