20-plus-year effort to boost hellbender populations in Missouri hits major milestone

A joint effort by the state of Missouri and the St. Louis Zoo to boost the populations of two endangered salamanders has reached a major milestone.

Researchers in October discovered that an Ozark hellbender that had been born at the zoo and released into the wild was protecting a clutch of 128 eggs. A later visit confirmed the eggs had hatched. It was the first time a hellbender raised in captivity had successfully reproduced in the wild.

“If one animal is breeding in the wild, I’m sure others are. We just have to get lucky enough to find those animals,” said state herpetologist Jeff Briggler, who was on the team of researchers that discovered the eggs. “But definitely this is a huge milestone that we’re making progress in the recovery of this species.”

Rivers in the Ozarks used to support as many as 27,000 Ozark and eastern hellbenders, which have existed in the fossil record for more than 160 million years. But poor water quality, habitat loss and illegal collecting had pushed the population as low as 2,000. Both the Ozark and the eastern hellbender have been on the federal endangered species list since 2011.