Ladybirds around the world are in danger from an invader that inadvertently wipes out its competitors using a biological weapon.

The interloper is the harlequin ladybird (Harmonia axyridis), one of the world's most invasive insects. From its homelands in central Asia, H. axyridis was introduced to Europe and North America to control aphids. Since then, however, it has become a serious pest that has put native ladybird species under threat by outcompeting or even eating them.

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