Squirrel River Pines features a fine example of northern dry-mesic forest situated on a narrow, sandy peninsula running northeasterly towards the Squirrel River. The forest is dominated by a stand of old, large red pines in the 16" to 24" diameter size class, with a few trees up to 30" in diameter. The natural area supports a diversity of animals, including characteristic species such as pine warbler, red squirrel, and red-breasted nuthatch. Bald eagles have used the pines as a nesting site.