For more than 10 years, the San Diego Zoo Wildlife Alliance has led an effort to bolster the population of a threatened species, the mountain yellow-legged frog. But as the zoo’s facilities have ...

The scientist traipses to a pond wearing rubber boots but he doesn’t enter the water. Instead, Brad Hollingsworth squats next to its swampy edge and retrieves a recording device the size of a deck of ...

THE SANTA ROSA PLATEAU ECOLOGICAL RESERVE, Calif. — The scientist traipses to a pond wearing rubber boots but he doesn’t enter the water. Instead, Brad Hollingsworth squats next to its swampy edge and ...

Following a species rehabilitation effort by the Birch Aquarium at Scripps, San Diego Zoo Wildlife Alliance, UCLA and others, more than 350 endangered Mountain Yellow-legged Frogs have been released ...