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At Katmai National Park & Preserve in Alaska, salmon are the lifeblood of a fertile coastal ecosystem. At Brooks Falls, the salmon must run a gauntlet of hungry bears, wolves, birds and other fish-eaters before proceeding further inland to spawn. Every summer, tens of thousands of sockeye salmon migrate from Bristol Bay to spawn in rivers adjacent to large lakes, such as the Brooks River, which connects Lake Brooks and Naknek Lake in the park. These homecoming salmon—weighing an average of 5-7 p