Savannah Sparrow (Passerculus sandwichensis) lives in grasslands and savannas across North America. It feeds on insects and seeds. Its conservation status is Least Concern.
Fascinating facts about the Savannah Sparrow
- Savannah sparrows range from tiny 11-cm sparrows to 17-cm birds, a size spread comparable to a ruler and a paperback. Their wingspan stretches 18-25 cm, letting them dart low over grass like a miniature helicopter, while body mass varies from 15 g to 29 g, roughly the weight of a few pennies. In the nominate subspecies the average weight is just 20.1 g (0.71 oz).
- A female Savannah sparrow builds a hidden ground nest and lays between three and six speckled eggs, most often four or five. She sits on them for 10-13 days (averaging 12 days) while the embryos develop, then the altricial chicks hatch blind and featherless. The young stay in the nest for about nine days before fledging.
- Video cameras at 206 grass-land nests revealed that chicks often bolt from the nest within an hour or two, but more than 20 % of nests with at least two chicks needed two to three days for every sibling to leave. The first chick may wait up to 5.8 hours after sunrise before daring to fly, a timing that varies by species and reflects the constant threat of predators like raccoons, foxes and hawks. This staggered fledging shows how young birds weigh the need for parental food against the danger of exposing themselves.
- Savannah sparrows migrate south each fall, leaving breeding grounds from September through October. They reach Kentucky by February, move into Missouri and southern Canada in March, spread across South Dakota and Nova Scotia in April, and finally arrive in Alaska by early May.
- In the wild a Savannah sparrow may live up to 6.5 years, though most individuals survive only 4 years on average, with annual adult survival rates of 28-42 %. In captivity the longest-lived bird reached at least 18 years, and typical captive lifespans are around 12 years. These numbers show that while the species is broadly common, individual birds face high mortality from predation, weather and habitat loss, underscoring the importance of protecting the grasslands they depend on.
Sources
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At a glance
RangeNorth America
HabitatGrasslands and savannas
DietInsects and seeds
About the Savannah Sparrow
As the warm sunlight dances across the grasslands, the Savannah Sparrow emerges, its delicate form flitting effortlessly through the tall blades, its brown-streaked feathers blending seamlessly into the rustling landscape. With a gentle rustle of wings, it alights upon a swaying stem, its bright, inquisitive eyes scanning the surroundings with an air of quiet confidence, as if savoring the simple joys of its sun-kissed domain. In this serene and idyllic world, the Savannah Sparrow reigns, its sweet, melodic song a testament to the beauty and wonder of the untamed wilderness.
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