On June 24, 2011, we handed over four nene (Hawaiian geese) to Haleakala National Park staff, who took them away for release in the crater of the dormant volcano on Maui, Hawaii. These birds had received the routine physical examination before their release and had been micro-chipped and banded for identification in the wild. Nothing unusual there: the San Diego Zoo’s Hawaii Endangered Bird Conservation Program has released 442 nene (pronounced nay nay) since 1996, helping to augment wild populations on the Hawaiian islands of Maui, Kauai, and the Big Island, as well as establishing an entirely new population on Molokai. But importantly, these birds represented the last two breeding pairs from the nene captive propagation flock at the Maui Bird Conservation Center (MBCC).
In April this year, we had received the news from our partners, the U.S. Fish and Wildlife Service and the State of Hawaii Division of Forestry and Wildlife, that it was time to end the captive propagation-and-release program for nene. The nene population throughout Hawaii has risen to nearly 2,000 birds, having been at a low point of only 40 birds in the 1950s, representing a very significant conservation success story. With the population now at this level, captive propagation is no longer considered the most efficient tool for further recovery of the nene. But management of the wild population by our field partners will continue to play a vital role.
So having hatched 395 goslings, we are coming to terms with the fact that we will no longer have gray fuzz-balls as the focus of our attentions over the winter months. Crucially, however, our spirits are lifted by the knowledge that captive propagation and release have been instrumental tools in bringing back the nene from the brink of extinction. It is time for us to say “job well done.”
One pair of nene, known to the staff as Red Rocket and Nu (pictured at top), will remain at the MBCC facility. Red Rocket (a female) was wild hatched in December 1987, though in her 24 years she has never laid a single egg! She happily spends her time with the male, Nu, who was hatched at MBCC in June 1992 from a wild egg. We are very glad to still have these two retirees to keep us company.
Amy Kilshaw is a research associate at the Maui Bird Conservation Center. Read her previous post, Honk if You like Nene.