They nest in trees for two reasons- firstly, because any small birds that have made their nests in the same tree make convenient prey for owls, since most birds sleep at night and would be unwary of an owl's approach, whereas owls are nocturnal and could catch them unawares. Secondly, trees make good vantage points for spotting prey on the ground which the owl can swoop on, including mice, shrews and voles.
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