Henslow's Sparrow is a secretive, easily overlooked grassland sparrow with a subtly beautiful pattern — a large, flat, olive-green head, a rich rufous wash on the wings, and fine dark streaks on the breast — visible only when a bird finally perches up in the open, which it seldom does. Its claim to fame is one of the least impressive songs of any American bird: a short, feeble, hiccuping "tse-lick," so quiet and insect-like that it is easy to walk past without noticing. Yet learning that odd little note is often the only way to detect the species.
Henslow's Sparrow breeds in weedy grasslands, wet meadows, and neglected fields with tall, dense grass and standing dead vegetation, and it has been a species of serious conservation concern as such habitat has been lost to development and intensive agriculture. Encouragingly, conservation grasslands — including reclaimed lands and set-aside fields — have helped it recover, and it was downlisted by the IUCN to Least Concern in 2018. In Michigan it breeds locally in suitable grasslands, a skulking prize for birders willing to listen for its whispered song.
Feeds on insects and other small invertebrates during the breeding season, along with the seeds of grasses and weeds, foraging on the ground within dense grassland vegetation. It gleans prey and seeds from the soil and low plants, staying hidden in tall, thick grass.
It is secretive and stays hidden in tall, dense grass, rarely perching in the open. Its song — a feeble, insect-like "tse-lick" — is so quiet that even singing birds are easily overlooked.
It has been a species of serious conservation concern due to grassland habitat loss, but conservation grasslands helped it recover, and the IUCN downlisted it to Least Concern in 2018. It still depends on protected weedy grasslands and neglected fields.
Weedy grasslands, wet meadows, and neglected fields with tall, dense grass and standing dead vegetation. It breeds locally in such habitat in Michigan and benefits from grassland set-asides and conservation lands.
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