A team of scientists helped eradicate the island of the animals in 2008 and the isle has slowly rebounded.
“There are other things that these rats are doing that we hadn’t necessarily thought of,” says coathor Dan Croll, a conservation biologist at UC Santa Cruz and the founder of the nonprofit Island Conservation, which worked on the eradication.
The Aleutian islands without rats are loud, says lead author Carolyn Kurle, an ecologist at UC San Diego. In the height of summer, when they’re filled with seabirds, “It’s just bird cacophony all over the place,” she recalls. The rat-free islands are also filled with tall grasses, fertilized to lush growth by bird droppings. On the islands with rats, however, the grasses are much shorter—and “you notice they’re really quiet, because the birds are dead.
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