U.S. Fish and Wildlife Service (USFWS) reports that "Every year more than one billion birds collide with glass in the U.S. alone! While most fatal collisions happen at homes and buildings shorter than four stories tall, smaller structures like glass walkways and bus stop shelters also pose a threat."

When people pushback on our claims that 3 billion birds are killed by outdoor cats in the US each year, we gently point them to the US Fish and Wildlife Service which estimates between 1,400,000,000 and 3,700,000,000 bird deaths from cats alone!

Why did we start Chirp Up? And, why now? Because of reports like the 2025 U.S. State of the Birds report, which shows that “more than one-third of U.S. bird species are of high or moderate conservation concern, including 112 Tipping Point species that have lost more than 50% of their populations in the last 50 years.”