I was saddened to hear recently a news story from Australia, about a small bird, the regent honeyeater. It's now a critically endangered species. It's estimated that only 300 remain in the world.

They don't get the opportunity to socialise with others of their own species, and the male birds are beginning to forget their song. More of them are mimicking the songs of other birds instead.

Researchers are concerned that the males will not attract females by their distinctive traditional song, and the species could soon die out. There's a plan to play recordings of the honeyeaters' bird song to them, in an attempt to remind them how it goes.