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With only one breeding trumpeter swan pair left in park, Yellowstone biologists resort to “grafting”

JACKSON, Wyo. (AP) — A trio of sprightly two-day-old cygnets hears their new foster parents calling nearby. Instinctively, the young, captive-raised swans jump off a platform and paddle into the chilly waters of Yellowstone National Park's Grebe Lake.

Bad move.

This is a swan "graft," an effort to trick the two adult swans into raising the three young now swimming toward them.


https://www.sfchronicle.com/news/article/Biologists-intervene-to-keep-swans-alive-in-13104227.php

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