Pacific lamprey

A "scary-looking, slimy" Pacific lamprey stops in a migration tube at the Van Arsdale Fisheries Station in Potter Valley, California. Biologists from the U.S. Fish and Wildlife Service coordinated work with local tribes and partners throughout the state, including the California Department of Fish and Wildlife, to try and reverse the decline of lamprey, and avoid placing the species on the federal Endangered Species List. Credit: John Heil/USFWS