The other beaver had already been cleaned and was starting to recover by the time the second was brought into the rehabilitation center, Lane said.
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"They are doing fairly well. One is coping better than the other," DaLyn Erickson, executive director of the rehabilitation center, told the Salt Lake Tribune. "There is some evidence they did at least sample some of the food left for them overnight. We are doing what we can and hoping for the best."
The benign beavers are thought to be yearlings and possibly siblings. Wildlife rehabilitators are cleaning the fuel from the beavers' fur with dish-washing liquid, a standard and effective means of removing oil products from fur, feathers, and other animal parts.
Concerned locals can donate fresh willow or cottonwood branches to help feed the beavers. The beavers are also being fed spring greens salad mix, carrots, yams and apples. Erickson said the animals seem to have at least nibbled at the food.
Willard Bay is an artificial lake built as a reservoir for Salt Lake City. The 9,900-acre (40 km2) lake was separated off from the Great Salt Lake in 1964 and subsequently drained of salt water and filled with water from the Weber River.