For the seventh year in a row a Cerulean Warbler has arrived in the
woods above our home on the southern end of Snake Mountain in
Bridport/Cornwall. Here are number of males recorded during those years
over a transect of 3200 feet from my place north to Mountain Road. Also
given are first and last days observed.
2008 - 2 June 3 to June 13 (likely arrived mid-May; limited
observation by me)
2009 - 3 May 21 to June 8
2010 - 10 May 11 to June 26 (presumed "typical" breeding year)
2011 - 5 May 13 to June 25 (presumed "typical" breeding year)
2012 - 2 May 7 to July 7 (big windstorm broke canopy branches early
June; likely attempted second brood)
2013 - 1 May 10 to May 30 (unsettled behavior the entire time
present; perhaps reflecting events of 2012)
2014 - 1 May 13.
Note that a "presumed typical breeding year" is a little over six weeks,
a very brief stay. The 2012 extension of the birds into July was a big
surprise. It seems reasonable to conclude that the first nest (they are
very high in the canopy of tall trees) was destroyed. Apparently it is
rare for Ceruleans to lay two clutches a year, but it seems that is what
they did (by virtue of the extended departure date and the behavior of
Nice to have them back. I wasn't so sure based upon the limited
activity last year.