From the April 2009 SPARC Open Access Newsletter, by Peter Suber

The woods are full of misunderstandings about OA.  They thrive in almost every habitat, and the population soars whenever a major institution adopts an OA policy.  Contact between new developments and new observers who haven't followed the annual migrations always results in a colorful boomlet of young misunderstandings. Some of these misunderstandings are mistaken for one another, especially in the flurry of activity, because of their similar markings and habitat.  Some are mistaken for understanding by novices unfamiliar with the medley of variant plumage, adaptive camouflage, and deceptive vocalizations.  This field guide should help you identify 25 of the most common visitors to your neck of the woods.