A northern cardinal (left) in San Antonio, Texas. Peter B. Nyren / 500px / Getty Images
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In a new study, researchers have linked light pollution in urban areas to smaller eye sizes found in two common songbird species.
Researchers studied the northern cardinal and Carolina wren that live year-round in San Antonio, Texas, a city with an estimated population of about 1,472,900 people, and compared these birds to the same two species that lived outside of the city. The team also analyzed the eye size of two migratory bird species, the painted bunting and white-eyed vireo, which do not remain in the city for the full year.
The birds living in San Antonio year-round…
Read the full article originally published at www.ecowatch.com.
