Cut light pollution and treat glass to help migrating birds, say researchers

Spring bird migration has begun. Under cover of darkness, 2.5–3.5 billion birds will fly northward to their breeding grounds in the United States and Canada. According to the Cornell Lab of Ornithology, now is one of the most important times of year to keep birds safe by reducing non-essential lighting at night and treating window glass so birds can see it and avoid deadly collisions.