A recent study found a large-scale increase in the endangered Sierra Nevada yellow-legged frog in Yosemite National Park in California.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/yosemite%E2%80%99s-yellow-legged-frogs-bounce-back-near-extinction
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/mongabay
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/amphibians
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/frogs
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us