YOSEMITE — Thanks to the Yosemite Conservancy and the San Francisco Zoo, Yosemite National Park now has the makings of a robust population of California red-legged frogs in Yosemite Valley, after decades of absence. In the early 1950s American bullfrogs were introduced in Yosemite Valley. According to the Department of Fish and Wildlife, American bullfrogs were intentionally introduced into the western United States as a ...

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