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Even The Common House Sparrow Is In Decline Study Finds

February 13, 2021 by Editorial Staff Leave a Comment

European House Sparrow by Donald MetznerHouse Sparrows were introduced in Brooklyn in 1851. They expanded rapidly to become one of the most common species in the U.S. and Canada.

The European House Sparrow has a story to tell about survival in the modern world. In parts of its native range in Europe, House Sparrow numbers are down by nearly 60%. Their fate in the U.S. and Canada is less well known.

A new study by Cornell Lab of Ornithology scientists aims to clarify the status of this non-native species, using 21 years of citizen science data from the Cornell Lab’s Project FeederWatch. The results are published in the Wilson Journal of Ornithology.

FeederWatchers record observations during the non-breeding season when House Sparrows gather in flocks. Reports from nearly 12,500 sites were used and cross-referenced with the National Land Cover database to determine whether the U.S. sightings came from rural or urban locations.

Findings for the U.S. and Canada:

  • Winter flocks in urban areas were larger than flocks in rural areas.
  • House Sparrows declined in urban areas but remained stable in rural areas.
  • The study found that declines in House Sparrow populations were no greater when Sharp-shinned or Cooper’s Hawks were also present.
  • From 1995 to 2016, the proportion of FeederWatch sites reporting House Sparrows declined by 7.5% and mean flock sizes declined by 22%.

Latest estimates peg the population of House Sparrows at 82 million individuals. The global breeding population is estimated at 740 million (Partners in Flight).

Photo of European House Sparrow by Donald Metzner, Cornell Lab of Ornithology.

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Filed Under: Capital-Saratoga, Nature Tagged With: birding, birds, Cornell Lab of Ornithology, nature, Wildlife

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