A lot of fencing has been happening at Pilyara lately. Thanks to a state government grant, we are fencing stock out of the timbered gullies that lead down to our creek. This is designed to protect wildlife and vegetation, as we live in a beautiful, mountainous area of high conservation value. All this hard work is already paying off – for the first time in years we’ve spotted a pair of Superb Lyrebirds in a fenced off gully, quite close to the house. What a thrill!
Lyrebirds are famous for their amazing ability to mimic any bird song. They also mimic human sounds such as mill whistles, cross-cut saws, chainsaws, car engines, alarms, gun shots, camera shutters, dogs barking, babies crying and mobile phones. The male is renowned for the beauty of his long, lyre-shaped tail feathers and hypnotising courtship display. However our resident pair of lyrebirds bring more than beauty and music to Pilyara. They provide a far more practical service – as fire wardens in what is predicted to be a summer of deadly heat.
Recent studies show that lyrebirds reduce the chance of bush-fires in areas where they forage. They rake the forest floor in their search for worms and insects, burying leaf litter, speeding up decomposition, and reducing the amount of fuel available for bush-fires. They also inhibit the growth of ferns, grasses and other plants which would otherwise burn. The Latrobe University research was conducted in burnt and un-burnt sites of Black Saturday‘s two most devastating blazes. It showed lyrebirds reduced forest litter by a massive 1.66 tonnes per hectare over a nine-month period.
‘Our modelling suggests the reduction in litter fuel loads brought about by lyrebird foraging has the potential to result in markedly subdued fire behaviour…The loss of lyrebirds from forests could result in higher fuel loads and an increased likelihood of wildfires threatening human life,” said the report, published in the CSIRO’s journal Wildlife Research. ‘They forage like chickens, they’ve got big feet with really long toes so they’ve basically got rakes for feet. They rake through the litter looking for worms and little bugs, stuff to eat. They’re digging through that humus and litter layer looking for little invertebrates and whatever they can find.’
‘Through that process they reduce the litter fuel load by, on average, 25 per cent, or about 1.6 tonnes per hectare. And we put those figures into a fire behaviour model and found that that level of fuel reduction is enough [that] in low fire-danger weather conditions it excludes fire, fire’s not possible under low to moderate conditions. But even in more extreme conditions the fire behaviour will be more moderate, [with] lower rates of spread, lower flame height, so a less intense fire.
Our conclusion is that lyrebirds are reducing the chance of fires occurring in the areas where they forage and the ecological significance of that is that un-burnt patches within large wildfires are really important sites for animals to survive post-fire.’
On Black Saturday in 2009, the wind change that saved us, devastated Marysville and took many lives. Summer is always a tense time here at Pilyara. It’s lovely to know that we have at least two new fire wardens watching over us. 🙂 Play the video below for a taste of lyrebird song. (You have to skip the ad first) The great David Attenborough looks like he’s wandering around one of our gullies, and he misses the Whip Bird call.