How do nuthatches typically acquire their nesting sites in tree cavities?

Answer

They prefer to utilize existing holes created by rot or by other birds

A key shared characteristic is their preference for nesting in tree cavities, but unlike woodpeckers, nuthatches rarely excavate a full nesting hole from scratch, often enlarging existing openings instead.

How do nuthatches typically acquire their nesting sites in tree cavities?
taxonomybirdanimalNuthatch