The critically endangered regent honeyeater is losing its “song culture” due to the bird’s rapidly declining population, according to new research from The Australian National University (ANU).
Just like humans learning to speak, many birds learn to sing by associating with older birds of the same species. They risk losing this skill if adults become too rare. And if they don’t learn to sing a sexy enough song, their chances of mating are reduced.
“If endangered birds are unable to learn how to sing correctly, it seriously impacts their ability to communicate,” lead author Dr Ross Crates said.
“It could also be exacerbating the honeyeater’s population decline, because we know a sexy song increases the odds of reproduction in songbirds. Females will avoid males that sing unusual songs.”
The study found that in places where there were still reasonable numbers of regent honeyeaters, males sang rich and complex songs. Where the birds were rare, males sang simplified or “totally incorrect” songs.
“For example, 18 male regent honeyeaters – or around 12 per cent of the total population – were only able to copy the songs of other bird species,” study co-author Dr Dejan Stojanovic said.
“This lack of ability to communicate with their own species is unprecedented in a wild animal. We can assume that regent honeyeaters are now so rare that some young males never find an older male teacher.”
The study also showed regent honeyeaters born in captivity have totally different songs to wild birds.
The research team believe this could prove crucial when it comes to conservation.
“The unusual songs of captive-bred birds could reduce their attractiveness to wild birds when they are eventually released,” Dr Crates said.
“So we’ve devised a new strategy to teach young captive regent honeyeaters to sing the same song as the wild birds by playing them audio recordings.
“Loss of song culture is a major warning sign the regent honeyeater is on the brink of extinction and we still have a lot to learn about how to help them.”
The study is published in the journal Proceedings of the Royal Society B.
Top image: Murray Chambers
Humans are taking colossal risks with the future of civilisation and everything that lives on Earth, a new global study shows.
At Mulligans Flat Woodland Sanctuary you can spot animals that haven’t existed in their natural habitat for more than a century. Now the ANU experts behind this conservation experiment are taking it a step further.
A major rethink is needed to help more Australian renters benefit from rooftop solar, according to ANU researchers.
+61 2 6125 5111
The Australian National University, Canberra
CRICOS Provider: 00120C
ABN: 52 234 063 906