Dryads (genus Dryadis ) are very small viriosaurs endemic to western North America.  Dryadis songi (pictured above), is a particularly small, lively creature with a high pitched call.  These creatures eat tubers and low-growing plants and have been reliably reported to dine upon grubs and other invertebrates.  Dryads are common during the spring or summer, but become much rarer during the winter.  Whether this species hibernates or simply migrates is unknown.