Scientists have achieved a remarkable feat in conservation biology: they've brought back the lost song of the critically endangered regent honeyeater, one of Australia's rarest birds. Once a common sight in vast flocks across southeastern Australia, these songbirds have faced a dramatic population decline in recent decades, pushing them to the brink of extinction. With numbers now below 250 in the wild, the complexity of their song has also diminished. The typical song for Blue Mountains regent honeyeaters has virtually disappeared, replaced by a simpler version with half the number of syllables, which could impact their reproductive success. But a dedicated team of researchers has stepped in to save the day. They've used recordings and direct instruction from two wild-born male 'song tutors' to teach young zoo-bred regent honeyeaters their original wild call. This captive breeding program, ongoing at Taronga Zoo in Sydney since 1995, has been a three-year journey. In the first year, playing recorded songs to young birds daily for six months didn't work. The breakthrough came in the second year when wild-born males were recruited as teachers, with success rates rising. The team found that smaller class sizes (about six juvenile males per adult male tutor) were key to effective learning. Over three years, the proportion of juveniles learning the wild song increased from zero to 42%. This intervention has had a profound impact, making the zoo population the only remaining source of the traditional song culture. The restored song has been passed on to the next generation, with zoo-bred males teaching their offspring. Ecologist Dr. Joy Tripovich, who studies regent honeyeaters, expressed excitement about hearing the zoo-bred birds sing their restored song for the first time. Since 2000, Taronga and partners have released 556 zoo-bred regent honeyeaters into New South Wales and Victoria, including males who have learned their original song. Further research is ongoing to assess the impact of the song tutoring program on the birds' success in the wild. The ultimate goal is to achieve self-sustaining populations, with wild and captive birds interbreeding, a historic milestone in conservation efforts.
