Harlequin ladybirds escape parasites which attack native species, scientists have found.
Harlequin ladybirds settled in the UK from Asia in 2004 and rapidly spread across the country.
The decline of several native ladybird species has been attributed to the arrival of these invasive insects.
Experts studying the invasion found that the harlequins were significantly less susceptible to parasites which prey on native ladybirds.
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