On my second day in Boston I headed for the coast. I made the hour long walk to Castle Island Causeway. The causeway reaches out into the Atlantic Ocean creating rocky shore and beach habitat for birds and other marine creatures.
Starting on the south end of the causeway I worked my way north. On any pier jutting into the ocean there were Double-crested Cormorants and Herring Gulls. As far as species diversity I was once again disappointed. The beaches looked incredibly hospitable to migratory shorebirds but they were mostly empty. In addition to empty beaches, the ocean out past the causeway was also empty with the exception of a few gulls and cormorants. Perhaps the time of day factored in as boat traffic was persistent.
With few species on the shorelines I turned my attention to the gulls floating along inside break walls. I got great looks at Great Black-backed Gulls which are by no means rare in New England but can be rare in Wisconsin. Ring-billed gulls and a few Laughing Gulls were also present.
Walking along the edge of Castle Island I spotted a few Barn Swallows heading south along the ocean and my only shorebird species of the whole trip: A Black-bellied Plover. The plover was sitting on some rocks lining the causeway that slanted into the water. Near this area there was a lot of kelp and other plant matter washed up which looked like great habitat.
I made one more pass around the causeway but came up empty for new species. Overall I was disappointed with my lack of species at Castle Island but it was nice to be out at the ocean.