They are migrating and here in force, along with shorebirds, a bit early. This morning was like watching aerial dog fights as they fought over the flowers in the yard; very territorial critters. Glad they are so small. Leamings Run or Wells Mill CP should be good places to visit over the next week or so.
http://www.learner.org/jnorth/maps/humm_fall2012.html
http://www.learner.org/jnorth/maps/humm_fall2012.html