The Cerulean Warbler is another rare species known to breed in the area. There are estimated to be fewer than 1000 pairs nesting in Canada and numbers in the US are in decline. This spring I will be checking suitable habitat (mature hardwoods) for their presence.
Today I visited a woodlot we had skied through last winter - we'd made a mental note to return to observe the breeding birds. While much of the woodlot seemed perfect for Ceruleans, I found none until I was deep in the lush core. I stopped to listen to a Red-headed Woodpecker calling when I heard the first of many Cerulean songs. I estimated that there were not fewer than four males singing. Given the season, I can't rule out the possibility that these were migrants. I'll return in a few weeks to get a better sense of what's going on.