Abundance: Occasional Season: Transient/migration season Habitat: Riparian Slide #59.06.14 - Adult V. s. cassinii (May 24). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature. Slide #59.06.03 - Adult V. s. plumbeus (Jun 23). Photograph © James R. Gallagher. Original available from the Sea and Sage Audubon Library of Nature.