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House sparrows have colonized six continents in 200 years
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House sparrow
Similar Species to Eurasian Tree Sparrow, All About Birds, Cornell Lab of Ornithology
Eurasian Tree Sparrow Overview, All About Birds, Cornell Lab of Ornithology
All about the Tree sparrow - GardenBird
What's the difference?: How to identify some of our most common sparrows | Forest Preserve District of Will County
Tree Sparrow (Passer montanus) - Woodland Trust
Nature News: Chipping sparrow an unsung beauty
Bird Species Comparison: House Sparrow vs Tree Sparrow - YouTube
House Sparrow | Celebrate Urban Birds
American Tree Sparrow | Missouri Department of Conservation
House Sparrow v Tree Sparrow | How To Tell The Difference - YouTube
Eurasian Tree Sparrow - eBird
Male House Sparrows Rise to the Occasion | Naturally Curious with Mary Holland
