Finding rare birds in Massachusetts for my 250 bird challenge!

Episode 4 of my 2025 challenge to photograph 250 bird species in Massachusetts. I return to Cape Ann, picking up several new species including a hard-to-find Black Guillemot, and I make yet another visit to Castle Island to find an uncooperative Barrow's Goldeneye and a rare Glaucous Gull.
The 2025 challenge list so far:
tinyurl.com/mv...
My gear:
Canon R7 mirrorless camera
Canon RF 100-500 mm lens
DJI Mic 2 lapel microphone
Channel life list (birds shown well on the channel):
World: 235
ABA area: 214
Massachusetts: 188