The murmuration of swallows is a dependable late summer highlight on the Connecticut River with a view too beautiful to miss. Be sure to book your seat on one of our evening cruises from late August through mid-October.A large mass of rolling swallows assembles as the sun begins to set at the end of each day. As you look into the distance it is difficult to determine exactly what is heading your way. As the black mass nears, you see that it is roughly 300,000-500,000 birds; each night is a different show which typically lasts from twenty to thirty minutes. The next spectacle begins as the birds choose a flight path to their bed for the night as they nestle among the Phragmite australis (common reeds) of Goose Island. On some nights, the swallows form a swirling funnel and others it looks like waves of rain falling from the sky. Cruising aboard the Onrust is a unique way to view the scene. Although any time from Memorial Day weekend through mid-October is a great time to be aboard the Onrust, a re-creation of the boat Adriaen Block built in 1614, the swallow murmuration ranks as one of the most compelling times to be out on the river. Passengers may bring a picnic dinner and beverages on board. The 6 p.m. swallow cruise is $33. Plan to arrive early enough to tour the museum. With purchase of an Onrust cruise, admission is only $5. During the season, she is open for dockside tours, public cruises,school, and Scout programs. Onrust is also available for private charters.