This year’s Great Cocky Count has shown that their numbers have dropped at a rate of 15 per cent a year over the past six years.
At this rate, the bird will be extinct by 2029.
Frasier’s Landing in Coodanup and Point Grey are two areas that are important feeding grounds for both species of the cockatoo.
Keen ornithologist and Birds Australia Volunteer Ken Monson said he had noticed a decline in bird sightings in the region.
‘I got upset when I saw a flock of 10 of them and they were probably all old. They used to travel in flocks of 50 once,’ he said.
‘I took a photo of them eating grasses and performing a mating dance and that spot is now being cleared for a shopping centre.’
The Great Cocky Count 2014 report showed that Dawesville was an important area for the cockatoos.
Volunteers counted 281 birds at two different sites, which made it one of the 10th largest roosting sites for the cockatoo.
Two roost sites were also identified in the City of Mandurah.
State Labor wants Federal Environment Minister Albert Jacob to take action to save the Carnaby’s cockatoo.