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第 16 页CC0 1.0（公有领域）
Grand Canyon river photographer Ellsworth Kolb set out in 1916 to be the first to run the Gunnison through the Black Canyon for sport. Capsizes, dynamite, a broken kneecap, snow and a sunken boat later, he finished the job in 1917.
第 17 页CC0 1.0（公有领域）
Nearly two decades of bird surveys across Colorado Plateau parks found 14 significant population trends — eight rising, six falling — and in 2023 added three species new to the program.
