When wolves on one island off Alaska’s coast finished off nearly all the deer around them, they turned to a surprising substitution: sea otters.
Although wolves in Alaska will eat just about anything that moves, their typical main course consists of deer, deer, and more deer. But when wolves on one island off the state’s coast finished off nearly all the deer around them, they turned to a surprising substitution: sea otters.
Small populations of wolves have long been considered doomed without large herbivores to eat. For example, in 1960, a pack of gray wolves became established on Coronation Island, a tiny isle off the Alaskan coastline south of Glacier Bay National Park. The wolves quickly decimated the island’s black-tailed deer population. They pivoted to harbor seals before resorting to cannibalism. After 8 years, only a single wolf remained on the island, dooming its pack.
In the wolves’ scat, the researchers found DNA from nearly 40 different species including snowy owls, porcupines, halibut, and sperm whales. However, the most common prey items were Sitka black-tailed deer and, unexpectedly, sea otters .
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