They are territorial and highly aggressive birds who compete with and displace native wildlife for habitat areas. They take over tree hollows and plug up nest sites they are not using, forcing possums and birds out and ejecting nestlings and eggs from their nests. They also compete with native fauna for food and habitat.
It is important to distinguish the pest Indian Myna from the common Noisy Miner. Indian Mynas are predominantly brown with a black head. In flight, white wing patches are clearly visible. Noisy Miners are native birds that are predominantly grey. They are protected and must be released if trapped.