Blue-Winged Warbler (Angry Bird)

Today (June 8th) was another gorgeous day--in the early 80s, so it could be hot in the sun.  I took a walk through Exton Park in the afternoon (4:30 p.m.).  A mile-long trail in the park is designated as a conservation area due to the amount of wetlands.  No recreation or even dogs are allowed along it.  There is a pond in the center.  It is densely wooded (mixed forest) with a small path maintained for observers.  I saw so many birds here!  It was just tough to get good photos:

That red arrow is pointing to a Blue-Winged Warbler.  This was a bit of a difficult identification process.  Blue-Winged Warblers are tiny birds and have a mostly yellow body.  They have a pointy black bill and black lines going back towards their eyes (almost like eyeliner!).  Their wings are bluish-gray with wingbars.  The observation that determined the ID for me was their song.  I kept thinking I periodically heard some sort of buzzing insect--it was the warbler!