Kirtland's Warbler is Michigan's most celebrated bird — for decades it nested almost nowhere else on Earth. A relatively large, tail-bobbing warbler, blue-gray above with black streaking and a lemon-yellow breast, it has extraordinarily precise habitat needs: it will nest only in dense stands of young jack pine, roughly five to twenty years old, growing on the sandy soils of the northern Lower Peninsula. When the trees grow too tall, the birds abandon them, so the species depends on the cycle of fire (and now careful forestry) that keeps producing young pines.
By the 1970s and 1980s the population had crashed to only a few hundred singing males, threatened by habitat loss and heavy Brown-headed Cowbird parasitism. An intensive, decades-long recovery effort — planting jack pine, managing habitat, and controlling cowbirds — brought the bird back so successfully that it was removed from the federal endangered species list in 2019. It remains a conservation-reliant Michigan icon, sought after by birders who travel to the jack pine plains each summer to see it.
Feeds on insects and caterpillars gleaned from jack pines and low vegetation during the breeding season, adding berries and fruit especially on migration and its Bahamian wintering grounds. Its diet is typical of warblers; it is habitat, not food, that so narrowly defines the species.
It nests almost exclusively in young jack pine forest on specific sandy soils, a habitat concentrated in the northern Lower Peninsula. For most of its known history it bred essentially nowhere else, making it a Michigan specialty.
A sustained recovery program planted and managed young jack pine and controlled nest-parasitizing Brown-headed Cowbirds. The population rebounded from a few hundred males to several thousand, and the bird was removed from the endangered species list in 2019.
Yes, with care. The birds return to the jack pine plains from mid-May, and guided tours in the northern Lower Peninsula let birders see them while protecting the sensitive nesting habitat.
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