A family of the largest rodents in North America were released in a California watershed “for the first time in over a century,” officials said. Beavers were once staples of the watershed on the Tule River Indian Reservation, and they were featured in pictographs dating back about 500 to 1,000 years, tribe members and state officials said.

The first release on June 12 included three kits, three adults and one subadult, followed by two more beavers released June 17, officials said. The animals can offer significant ecological benefits.

The beavers’ dams will improve water retention on the land by slowing down the flow of the river, which provides the vast majority of the tribe’s drinking water, officials say.

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