Assertion: barred owl's nest | /r/AtLocation | hollow trees
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Source sentences:
text: Of my 38 nests, 18 were in old nests of red shouldered or Cooper's hawks, often in a nest of the previous year; in some few cases the hawk has used the nest again the following year; 15 nests were in hollow trees, and 5 were in what were apparently old squirrels' nests.