It could be argued that the potential harm they might inflict is proportionately little. However, there have been anecdotal accounts of parakeets battling for nesting grounds with frequent native birds, so we can assume that they may compete with nearby cavity nesters like the common hill myna and long-tailed parakes.
From a biologic standpoint, it is currently unnecessary to categorize them as an invasive species.
Occasional Slaughtering COULD NOT BE A PROLONG-TERM ANSWER.
Some might contend that the red-breasted parakeet’s loud nature causes noise pollution, which would support categorizing them as invasives. The subject of population control is finally brought up.
The effectiveness of slaughter techniques is unquestionably something to consider, and the non-native house crow serves as a great illustration. Due to the disruptions they cause, property birds are considered pests in Singapore.
Their numbers have decreased compared to two years ago as a result of local slaughter efforts. Even if all property birds in Singapore were eradicated, it would only be a matter of time before they recolonize the country from Johor, even though this may indicate that the answer is successful.
The red-breasted parakeets you follow the same logic: Eliminating the birds in Choa Chu Kang or abroad may be a temporary solution, but given their capacity for rapid reproduction and dispersal, the bird population may quickly recover.
Whether the” problematic” species in question are animals, monitor snakes, or otters, the same issues may go back as long as the fundamental problem of human-wildlife conflict remains unresolved.