Many Manx
On Tuesday evening I stopped by Revere Beach to see if I could see the Manx Shearwaters. I also went with the hope of watching them as late as possible to see if they would give any hints as to where (if at all) these birds are nesting. Several sources cite Manx Shearwaters as congregating in the evening in the waters near their nests. Their nest are often burroughs on lightly vegetated islands or on cliff ledges. If these birds are found to nest in the Harbor it would be only the second record of nesting Manx Shearwaters in the United States - the first occcured on an island off Cape Cod in the 70's.
When I arrived at the beach I had picked up the birds prior to parking the car as they "shearwatered" up and down the beach. I pulled over and watched them all come to rest a good distance off the beach - There were 8!

It was 7:30PM at this point and I was determined to watch them as long as possible. After about 15 minutes of preening they all took off and began to "shearwater" - at one point three flew directly over my head!!! Unfortunately my camera skills were not adequate to catch them in focus, but here are some further out -

They came to rest in the exact spot as they took off from. I watched for some time more and for a second time they took off. Rather than fly up and down the beach this time they made one wide arc and ended up 1/4 mile north and east from where they started. I moved to their new location and watched.

Rather than sit still this time they actively swam in the direction of Nahant. I started to get excited - maybe they were nesting on Egg Rock. At about 8:15 I observed what I thought at the time was a "territorial" or "pairing" display. Two of the birds raised up exposing their white breast and began flapping and then chasing each other. This continued at various levels of intensity until three of the birds had enough and left the main group. It was dark enough at this point that I was forced to make a decision on which group to watch for I would surely loose the one I left. I remained with larger group.
Now as it was almost too dark to see one of the birds began a strange display. It would rear up like a loon in display -lifting its body up - but the Manx did not spread its wings, and it started to rhythmically bob up and down in the water. It was really cool. It did not appear to be directing this display at any other individual bird.
The following is from Cornell's Birds of North America Online -
"Flocks participate in mutual flights offshore near colony, with large groups splitting apart and forming several smaller groups (Lockley 1942). Offshore at dusk, shearwaters may form tight groups with individuals facing inward, cackling and posturing at each other with downward-pointing beaks, followed by rushing and chasing, then group pursuit, and finally by diving in unison (Tulloch 1977)." (BNA)
At about 8:35 the birds took flight I was able to follow them, but just barely - they reconnected with the other three birds that I had lost track of and headed straight up the beach to the north where I lost site of them - with no better idea of where these birds might be nesting then before.
If anyone has a boat or a good "in" with the NPS let me know - my gut tells me they are nesting in the cliffs of Great Brewster Island but I would love to spend a night or two out on the islands trying to find out. At one point the Revere Breakwater was floated as a possible location, but I have seen the water rush over those rocks twice since the birds have been spotted and it is connected to shore at low tide which also makes me doubt this as a breeding site. I haven't seen anything written on average distance from nesting sites for these evening congregations but they clearly are evening congregations.
GOOD BIRDING!














