Several woodpecker species are classified as vulnerable or endangered:
Helmeted Woodpecker - Classified as vulnerable, with some researchers suggesting it should be considered endangered due to threats like habitat loss (source).
Red-Cockaded Woodpecker - Listed as endangered since 1970, primarily due to habitat destruction (source).
Ivory-Billed Woodpecker - Once considered endangered, it is now believed to be extinct due to extensive habitat destruction (source).
These species face significant threats from habitat fragmentation, logging, and environmental changes.