DSL | By PHYS.ORG - Urban Light Pollution Linked To Smaller Eyes In Birds: Study

Researchers found that songbirds including the Northern Cardinal (pictured here) that live year-round in the urban core of San Antonio, Texas, had eyes about 5% smaller than members of the same species from the less bright outskirts.

Offered by Washington State University for PHYS.ORG 

Image credit: Jennifer Phillips, Washington State University.