To prevent the outright extinction of the Regent Honeyeater of Australia, scientists came up with the idea of teaching it to sing again.
On the Brink of Irreversible Extinction
There are, indeed, paths to counter the potential extinction of a threatened species. In the eucalyptus forests of southeastern Australia lives a small black-and-yellow bird named the Regent Honeyeater. This endemic passerine was once fairly common. But since the 1980s, its population has fallen from about 1,500 individuals to barely a hundred in the wild today.
In light of these numbers, the species is now on the brink of irreversible extinction, especially as its eucalyptus forests become increasingly fragmented. An unintended consequence of this rarity: young males are so isolated that they can no longer mingle with experienced males to learn the mating song…
The Regent Honeyeater
The Regent Honeyeater (Anthochaera phrygia) is a small nectarivorous passerine in the honeyeater family. Easily recognizable by its black plumage adorned with bright yellow patches on the wings and head, it measures about 20 centimeters and has a slightly curved bill suited for sipping nectar from eucalyptus blossoms. This songbird plays an important role in pollinating many Australian plants. Once widespread in open forests of the southeast, it depends heavily on blooming eucalyptus and large trees for nesting, which makes it particularly vulnerable to habitat fragmentation and destruction.
A Song Key to Reproduction
To such an extent that some individuals begin to mimic vocalizations… from other bird species! An oversight that has direct consequences on the species’ reproduction, as females naturally prefer males capable of performing the Regent Honeyeater’s typical song. Thus, according to scientists, about 12 percent of observed males no longer sing the species’ own repertoire.
Without song, no reproduction… So scientists decided to fight the Regent Honeyeater’s definitive extinction by teaching it to sing again! Indeed, being able to attract a mate and reproduce begins with being a charming singer and mastering the right vocalizations. First step: use recordings of Regent Honeyeater songs to play to the youngest birds.
Calling in Wild Males
But that alone might not be enough. Scientists at Australian National University also took young birds from different parentage and paired them with a wild male who sang correctly. A strategy to recruit males to serve as natural singing tutors…
The results were remarkably convincing: in a study published in Nature Scientific Reports, “the proportion of juveniles that learned the wild song rose from zero to 42% in three years.” In learning the right vocalizations, these Regent Honeyeaters may yet avoid disappearance.
