With crossed fingers, caretakers backed out of the Hawaiian foliage last year after five hand-raised , or 妡Alal, fluttered out of an aviary and into their native forest. The species had been extinct in the wild since 2002, and this was the 妡Alal Projects defining moment: Would these five birds be able to establish a new population?
They were not. Within a month, three members of the cohort diedtwo from hawk attacks and one from unnamed environmental stressors. Efforts to save the wild 妡Alal population date back to the 1970s, and the project is the most recent attempt to achieve establish a new population. After the first three deaths, though, the researchers quickly and brought the two survivors back into captivity.
Now, a little more than a year later, the team has tried again, and a new group of 妡Alal have ventured into the Hawaiian wilderness.The project released 11 crowstwo of which were last year's survivorsin the past couple months. A was released into the Puu Makaala Natural Area Reserve on the big island of Hawaii on September 26, and entered the forest in a slightly different location on October 11. With more than twice as many birds venturing into their native habitat than last time, the researchers are optimistic that this new crop will thrive. Since the last year's introduction, the team overhauled its reintroduction strategyespecially the methods for acclimating 妡Alal to predatorsand believe the bird's are much better prepared this time around.
The first loss served as a painful reality check. Our team had been working very hard, for months and years even, to raise these birdsfrom being laid as an egg to hatching out, and then being released into the wild, says Bryce Masuda, a San Diego Zoo Global conservation program manager who works on the project. It was really difficult for all of us. At the same time, the outcomes were also a learning experience, says Jackie Gaudioso Levita, the project coordinator for the .
For one, this time the team made sure the birds would stick together in the wild. For almost nine months, the researchers observed each crows behavior before and after feeding, taking note of who was pushy, who begged, and who got to the feed bowl last. Dinner time manners indicate social hierarchies for 妡Alal, so the team parsed the two groups based on which individuals were most likely to get along.
Then training for the wild really began. The number one priority was teaching the 妡Alal to recognize and avoid the , a native Hawaiian hawk. Though the team taught the crows to dodge their natural predator before the 2016 release, this year's batch received what Masuda calls a suite of stimuli meant to get the 妡Alal riled up during 珛棗 attacks.
The system the team used imitates the natural process of events when the hawks hunt. First, the birds heard playbacks of 珛棗 hunting calls; then, they saw a taxidermied version of their foe soar overhead. Recordings of 妡Alal warning cries were next broadcast through speakers, and for the finale, a live 珛棗 in an adjacent cage flapped its wings. Levita and her team tested the drill on older, breeding crows first to make sure they squawked and took notice of the faux danger.
During all of the sorting and training, the team also scoped out drop-off locations within Puu Makaala using a new tactic often used by business strategists. Called (strength, weakness, opportunity, and threat) analysis, the method helped the researchers weigh factors like 珛棗 scarcity, native fruit abundance, and accessibility for daily research monitoring.
All these efforts culminated in a delicate introduction for the birds. First, the crows moved to a pseudo forest environmentan aviary within the Puu Makaalauntil they settled down. Then, when the doors were finally flung open, each 妡Alal wandered out on its own time, explained Masuda. Some zipped out immediately; others lingered in the comforts of home for hours.
Now the team waits. Until the birds' foraging habits fully kick in, San Diego Zoo employees will supply them with extra food and monitor their weight using feeders equipped with small scales. So far, though, the 妡Alal are fending for themselves fairly well. They strip bark from trees to get at insects and find native berries to snack ona process that's important for indigenous fruiting plants, which could use the dispersal boost from crows scattering their seeds.
When the year of observation ends, the birds should be completely independent and ideally will have established a baseline population in Puu Makaala. Levita and her team plan to continue breeding in captivity and introducing younger batches of 妡Alal into the forest with their relatives, eventually building a flock that can boost their numbers on their own. And seeing as the group of six from September have already out-survived the 2016 cohort, the team has reason to be hopeful.
Locals are also rooting for the project's success. 妡Alal represent ancestral guardians in Hawaiian culture, and their presence or calls signify warnings of future misfortunes. Since the 妡Alal Project's creation, team members have given presentations at community centers and schools to update the region's residents on the birds progress. And when they announced the three deaths last year, people showed up in droves to learn what happened and how the project planned to move forward. With the latest round of releases, the locals are even more investedthey voted online to give each of the 11 妡Alal a native Hawaiian name. This, Levita says, shows that the birds are just as integral to the cultural fabric of the Hawaiian islands as they are to the ecosystem they belong.
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