A group of volunteers have begun selling 100 new bird traps to coincide with the season Indian mynas flock together.

The birds take over native animals' nesting sites in spring and are known to smother chicks to make room for their own spawn.

The pests have established colonies near Sacred Heart Cathedral and in Eaglehawk's High Street and Canterbury Park areas, conservationist Jenni Heinrich said.

"So we are particularly keen to get some traps out in those areas, if any residents are interested in helping," she said.

100 traps sold last year are already having an affect, with many people who installed them noticing rosellas returning to backyards.

"Those people are the frontline, because they notice straight away if mynas move into their nesting boxes.," Ms Heinrich said.

To find out more email landcareversusmynas@gmail.com