The Harlequin Ladybird Beetle (Harmonia axyridis) is a large, highly variable insect native to Asia that has become a globally widespread invasive species. Also known as the 'Multicoloured Asian Lady' beetle or 'Halloween bug', it was deliberately introduced to many countries as a biological pest control agent. Its successful establishment in new regions has negatively impacted native ladybird populations and can be a nuisance when it swarms indoors.