[SBB] Black Terns in New Chicago Marsh & Salt Pond A16

This morning Frank Vanslager and I decided to circumnavigate New Chicago Marsh, clockwise, starting at the railroad tracks where they cross the EEC (Environmental Education Center) entrance road. After about a half hour of fairly slow birding Frank spotted a breeding plumaged BLACK TERN flying low over the open water in the northwestern section of the marsh. Then, as I was preparing to call Mike Rogers, Frank spotted a second breeding plumaged Black Tern closely interacting with the first. Later, after Mike left, the BLTE disappeared and could not be re-found (earlier when they stopped flying we were able to locate them perched on adjacent posts in the water). Frank and I then continued our way around the marsh re-finding the BLTE flying low, feeding, over the northwestern section of Salt Pond A16. Best viewing was over the third island (counting from the EEC parking lot). I should note that as we talked to SFBBO personnel, "Jill" said that they had three Black Terns in the same area about three weeks ago but that they don't normally report such sightings (many areas they work are not open to the public). Those wanting to try for these birds should probably bird from the dike between New Chicago Marsh and Salt Pond A16 as it provides the best views of the Marsh and the Salt Pond (the Salt Pond cannot be seen from the railroad tracks). Use of scopes recommended but are not absolutely required.