Superb fairy-wren is ‘canary’ for effect of climate change on birds by Paul Simons, April 14, 2026, The Times
The superb fairy-wren of Australia is a bird that lives up to its splendid name. In its breeding season, the males feature a dramatic electric blue cape and tail and a black throat. The birds also have a fascinating social structure, co-operating with each other, with remarkable similarities to human groups, in families and then forming into wider communal groups that help to bring up offspring that are not their own. And in autumn and winter, one breeding group can even join up with other birds in a supergroup.
The superb fairy-wren is very familiar in parks and gardens across southeast Australia, but is now facing challenging conditions and could even face extinction within a few decades, largely driven by the warming climate.
A large population of the birds has been tracked for the past 38 years at the Australian National Botanic Gardens in Canberra. But this population has been declining over recent years with poor breeding success during dry springs, and the survival of the birds affected by unusually warm winters and hot summers.
Last year more than half of the superb fairy-wrens at the botanic gardens had died, the largest loss over a 12-month period.
“We found that although many individual impacts of climate change on the birds are small or moderate, together they are expected to have a catastrophic cumulative effect,” said Andrew Cockburn, emeritus professor at the Australian National University.
Even though the superb fairy-wren is a common bird in southeast Australia, its well-studied decline reflects more widespread declines in insect-eating birds not only in Australia but across Europe and North America. And so this small and charismatic bird has been held up as “the canary in the coalmine”, signalling deep-seated problems for many other birds struggling to cope with climate change.
The study of the bird is also a lesson in how some common species of birds can become extinct very rapidly. One striking case is the passenger pigeon that was once an abundant species, with an estimated population of between three and five billion individuals, but it went extinct in only a few decades after the first concerns about its declining numbers were reported.