Yellowstone National Park is down to a single wild pair of breeding trumpeter swans, and the nest for those birds has been failing year after year. To prevent a total collapse, the park has teamed with Wyoming Wetlands Society to essentially keep those birds on life support. This year the transplant of live cygnets back to the nest failed, but the long-term effort to restore the population is going well, mostly because of captive-raised birds that are being released annually.
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