Grasshopper Sparrow (Ammodramus savannarum) lives in open grasslands across North America. It feeds on insects and seeds. Its conservation status is Least Concern.
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When a nest fails, with many moving more than 100 m and some traveling as far as 8.9 km to a new territory within the same breeding season. Adult males show stark regional differences in site fidelity: over 70% return in Maryland, yet none do in Nebraska.
Grasshopper sparrows had a 2016 estimate of 31 million birds and a 68% drop between 1970 and 2014, losing about 2.59% of their numbers each year. More recent surveys show the decline accelerating to 3.48% annually. These steep losses, driven chiefly by grassland conversion.
In summer, grasshopper sparrows feast on insects for 69% of their diet, swapping the remaining 39% for seeds; in fall the balance flips, with seeds making up 71% of their diet and insects 29%. This seasonal swing shows how the birds rely on abundant ground-level prey in warm months and shift to stored seeds as insects wane, underscoring the need for year-round open grassland that supplies both food types.
Grasshopper sparrows, covering roughly 2,500 km in a single migration that lasts about a month. That pace works out to about 82 km each day, a speed comparable to a commuter train sprinting between towns.
These sparrows are pocket-sized powerhouses, measuring just 10-14 cm long, spanning 17.5 cm across the wings and weighing between 13.8 and 28.4 g, with an average of 17 g.
Sources
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In the sun-drenched expanses of North America's grasslands, the Grasshopper Sparrow flits about with an air of understated elegance, its muted plumage blending seamlessly into the rustling sea of blades as it searches for sustenance. With each delicate hop, it navigates the intricate tapestry of its native habitat, a master of subtlety in a world where camouflage is key to survival. As it sings its melancholic song, the sparrow's gentle melody wafts across the landscape, a poignant reminder of the beauty that thrives in these oft-overlooked wild places.
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