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When a greater percentage of Magellanic penguin chicks starved, a lower percentage fledged (F 1,24 = 56.4, P<0.001, R 2 = 0.70, N = 26 years, 3250 chicks). The 2 open circles represent 1991 and 1999, when rain killed >40% of chicks each year, and were not included in the regression.
