A majority of penguin species are known to choose the same partner from one mating season to the next, but not all species do and not all individuals within a species are guaranteed to. Gentoo penguins pick the same partner 90% of the time, Chinstraps 82% of the time, and Adelies, the species known for giving one another gifts of stones, only remate 62% of the time. In fact, some penguins will not even be monogamous within one season, having 2 to 3 partners.
The primary reason for finding a new partner would be if the mate does not show up at the last year’s nesting site, since Adelies have much higher fidelity rates for their previous nests than for their previous partners.
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