Reply to Worcesterwatcher. Some harlequin ladybirds are almost entirely black, and there is still a worry that they will out-compete, or even eat, native 7-spots. But there are also several native black ladybirds. You can download a ladybird ID sheet at http://www.ladybird-survey.org/ladybirds.aspx
I just found a weird ladybird its brown with black dots and had realy light brown legs i have been told this is the rarest type so im glad i had my camra!
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http://www.ladybird-survey.org/ladybirds.aspx