ladybirds

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Over the last few months we noticed ladybirds in our bathroom.It used to be one or two but since we removed the tiles round the bathroom window in preparation for some diy,every day ,when I get home,there are loads of them all over the window.The windows are kept closed so where are they coming from?Do we have a ladybird nest in the wall?I know they aren't causing any harm and we carefully put them outside but we're intrigued to know why they're here.Any body got any ideas?

[slinkycat]

Ladybirds hibernate over the winter, usually under bark etc, so maybe yours got into the cavity wall through a bathroom air vent, and they've been disturbed when you took the tiles off? Just a suggestion, I may be totally wrong!