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第 18 页CC0 1.0（公有领域）
Automated recorders at ten sites in Mississippi National River and Recreation Area heard eight of the nine frog and toad species known there in 2019, including the network's only Blanchard's cricket frogs.
第 19 页CC0 1.0（公有领域）
From 2006 to 2015, Park Service biologists sampled eaglets at three parks in its Great Lakes network. Lead in feathers fell over the decade, but hot spots remained, especially near Pig's Eye Lake on the Mississippi.
