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Sacramento National Wildlife Refuge Complex
Bullfrog young adult,Baskett Slough National Wildlife Refuge, OR
WISC - Washington Invasive Species Council
Sacramento River National Wildlife Refuge
Backyard Nature: Our bullfrog neighbors are quiet now. But just wait
California's battle to control non-native bullfrogs
The precarious persistence of the Endangered Sierra Madre yellow
Bull frog at Sacramento National Wildlife Refuge Complex
Sacramento National Wildlife Refuge Complex - A banded Snow Goose
Rescue for Recovery: Biologists Team up with Zoos to Save Frogs on
Amphibians and Fish - Sequoia & Kings Canyon National Parks (U.S.