原本被認為是幾乎絕跡的南加州原生青蛙，最近在加州聖貝納迪諾國家森林公園（San Bernardino National Forest）靠近愛德懷鎮（Idyllwild）附近的兩條溪流中再度現身。
今年6月，兩個各自抱著不同目標的科學團隊分別在聖荷森托荒野（San Jacinto Wilderness）發現了黃腿山蛙。
加州漁業與動物部（California Department of Fish and Game）正在進行一項有利於安吉樂斯（Angeles）國家森林内小石溪中瀕危黃腿山蛙的移鱒計劃。
A Southern California native frog believed to be nearly extinct has been rediscovered on two creeks in the San Bernardino National Forest near Idyllwild.
The - mountain yellow legged frog, Rana muscosa, is on the federal Endangered Species List and is classed as Critically Endangered by the IUCN Red List of Threatened Species. Until last month researchers had estimated only 122 adult mountain yellow-legged frogs remained in the wild.
In June, two separate groups of scientists pursuing different goals each discovered mountain yellow-legged frogs in the San Jacinto Wilderness.
The frogs were spotted at two locations about 2.5 miles apart in the Tahquitz and Willow creeks in the San Jacinto Mountains. The number of frogs in the area has not yet been determined.
This rediscovery is a windfall for government and nonprofit partners working to increase the number of mountain yellow-legged frogs in the wild by means of habitat protection and restoration as well as a captive breeding and release program.
The San Diego Zoo was the first to breed a mountain yellow-legged frog in captivity. That animal has recently morphed from a tadpole into juvenile frog. The goal of the program is to breed mountain yellow-legged frogs in captivity and return them to their native habitat.
The frog recovery effort is funded by Caltrans to compensate for emergency work to stabilize a slope near the frogs' habitat on state Route 330 in the San Bernadino Mountains.
The California Department of Fish and Game is working towards completion of a trout removal project to benefit the endangered mountain yellow-legged frog in Little Rock Creek in the Angeles National Forest.
Trout were introduced to lakes and streams throughout the region in the late 1800s to benefit recreational fishers. However, tadpoles often become prey to non-native fish such as trout and at the tadpole stage, mountain yellow-legged frogs can take up to two years to mature, so are vulnerable to fish predation for a long period of time.
Trout populations have been reduced in one section of Little Rock Creek and as a result, frogs in that section have increased, demonstrating the success of this approach.
Globally, frogs and other amphibians are on the decline because of habitat loss, the effects of climate change, pesticide contamination and the spread of a deadly fungus.