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Swallow - Wikipedia
8 Swallow Bird Types You Should Know - Birds and Blooms
Tree Swallow Identification - All About Birds
Nuisance swallows | U.S. Fish & Wildlife Service
Barn Swallow Identification - All About Birds
Tree Swallow Overview, All About Birds, Cornell Lab of Ornithology
Swallows of the United States: Eight Swallows to Know
Swallow | Migration, Nesting & Feeding | Britannica
Tree Swallow | Audubon Field Guide
Barn Swallow | Audubon Field Guide