TRAPS are being deployed along the South Coast as part of surveillance and trapping efforts to catch an aggressive bird, considered one of the world's worst pests.
Staff from the Department of Primary Industries and Regional Development (DPIRD) have taken to the road to deploy traps, as part of its annual starling control program.
To coincide with the starling breeding season, traps will be located along a 300 kilometre stretch between Condingup and Hopetoun, and 200km along the coastline near the Western Australian/South Australian border.
DPIRD regional biosecurity co-ordinator Richard Watkins said while last season's surveillance efforts caught only one starling in the South Coast traps, five have already been caught this season.
"Our surveillance program is proving, year-after-year, to be an effective early warning and removal system for starlings, which we don't want to establish in WA," Mr Watkins said.
"The department has a 50-year history of delivering the control program that continues to keep WA starling free, despite starlings being present in other States."
While starlings predominantly feed on invertebrates, in high numbers they impact on cultivated grain and horticulture crops, foul wool, present a disease risk and displace native birds.
They also form large flocks that can foul infrastructure when roosting in built-up areas.
Mr Watkins urged South West residents and travellers to keep watch for these unusual birds.
"As with any pest surveillance program, it takes everyone to do what they can to protect WA," he said.
"We are grateful to the landowners who host traps on their properties and to the bird watchers and general public who vigilantly keep a lookout."
Starlings are small to medium-sized birds which have distinctive glossy black feathers with an iridescent green and purple sheen.
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