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第 18 页CC0 1.0（公有领域）
Preliminary results from juvenile coho salmon basinwide surveys in the San Francisco Bay Area indicate a decrease in numbers on Olema Creek and an increase on Redwood Creek when compared to the previous generation. For an eight consecutive year, surveys found no coho juveniles in Pine Gulch Creek.
第 24 页CC0 1.0（公有领域）
Migratory birds may travel great distances to take advantage of optimal feeding conditions. For example, birds that eat bugs may be adapted to arrive at their spring breeding grounds just as insects are emerging en masse after a cold winter. Other birds may journey to escape seasonal challenges…