Here’s the thing about birds that nest in tree cavities: not just any hole will do. Many species depend on certain plants for shelter, breeding, and roosting. If the host trees vanish, so could the birds. That’s already happened in some familiar cases, such as the extinction of the Ivory-billed Woodpecker, which primarily nested in giant cypresses in Louisiana, Arkansas, and Florida. Once those trees were cut down by loggers, the Ivory-billed Woodpecker disappeared with them. To help other threatened woodpeckers avoid the same fate, the logging industry should require loggers to leave behind the necessary numbers and types of trees the birds need to thrive. Should being the key word there. Current practices merely involve skipping over the large, dead trees, called "snags," that woodpeckers can use for their nests. Science has shown that selective logging does more than just save woodpeckers: Protecting their spaces also offers home security to other...