A Kirtland's Warbler forages in a Jack Pine. The relationship between the bird and tree is intimate. They only breed in near monocultures of the pine, and only pines between 5 and 20 years of age, or thereabouts. Small cherries and oaks are scattered about, and the birds will often use those as singing perches, and will also hunt caterpillars in them. The "Jack Pine Warbler" is doing well, with about 2,300 pairs, nearly all of which breed in the northern part of Michigan's Lower Peninsula, where I made this photo while scouting prior to the arrival of groups that I would be leading. The date was May 19.
In the late 1970's-early 1980's their collective population dipped below 200 pairs and doom seemed to be on the horizon. So, the current 5,000 or so birds may not seem like many but compared to four decades ago it's a bonanza. The Michigan Department of Natural Resources and U.S. Fish & Wildlife Service deserves kudos for implementing major management activities that have greatly benefitted the birds.
Kirtland's Warblers can be quite tame, and in the past I have had them approach within a few feet of me when laying on the ground observing them. One memorable bird came so near I was sure it was going to hop onto my leg, and its loud boisterous song practically hurt my ears.
I've led tours up here for about 12 of the last 13 years (Covid scrubbed last year) in conjunction with NettieBay Lodge. This morning, we were back in the elfin Jack Pine forests bright and early, Kirtland's Warblers singing all around. This group is keenly interested in botany, and we found ourselves looking at a sedge at one point. I saw a movement to the side, glanced over and there was a gorgeous male Kirtland's Warbler only 10-12 feet away in a small oak. Needless to say, we got good looks. Just prior to that, we had stopped at a clearcut in an early stage of succession, enjoying a cooperative Mourning Warbler. On the breeding grounds, they are not the shrinking violets that they tend to be in migration, and males will often tee up on conspicuous perches where they'll sometimes sing for five minutes or more at a time.
At that same spot was a Blue-winged Warbler, the second one that I've found since being up here on the current trip. And these are the first of this species that I've found up here in twelve years of fairly intense exploration during the breeding season. There are somewhat ominous overtones to the arrival of these Blue-winged Warblers, and I will try to write about that later.