I saw or heard at least six Field Sparrows, including one obvious pair. One male Common Yellowthroat was carrying a fat green caterpillar that looked as big as its head. Several Indigo Buntings were present and singing in the fields. A Willow Flycatcher was a pleasant surprise – perhaps it is more common in Middlesex County than I thought. Even better was a White-eyed Vireo singing near a pipeline cut that runs adjacent to the preserve. Along the same pipeline cut were a singing Prairie Warbler and an Orchard Oriole.
There were some butterflies active as well. The one above is a Question Mark in its winter form, which has orange hindwings and frosted edges.
At least 15-20 Cabbage Whites were clustered around a single mud puddle along the pipeline cut. Here are five of them.
Several Little Wood Satyrs were flying on a shaded trail.
As one would expect, a lot of Eastern Tailed-Blues were active in the fields. This one was cooperative.