What is the plural possessive form of the word woodpecker?

The noun 'wood' is an uncountable noun as a Word for a substance.

The possessive form of the uncountable noun is wood's.

The plural form of uncountable nouns for some substances is short for 'types of' or 'kinds of'.

The plural form for this use of the noun wood is woods.

The plural possessive form is woods'.

The plural noun 'woods' is also a Word for a large group of trees, a small forest; or an informal term for the woodwind section of an orchestra.

The plural possessive form is woods'.