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One study on Hokkaido found that 47 out of 110 old woodpecker holes were used by renters, which in the biological world are called secondary cavity users. And as in the human world, the suitability of these holes decreases with time (presumably some of the really old ones do not even have wifi yet).
Makes them sort of the renters of the woodpecker world rather than homeowners. As the bills of piculets are shorter and less dagger-like than those of the other woodpeckers, they re-use woodpecker holes for nesting, rather than making their own holes.
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