Join the National Audubon Society for a conversation with bird-glass collision researcher and leading expert, Dr. Daniel Klem, Acopian Professor of Ornithology and Conservation Biology at Muhlenberg College in Pennsylvania.

His new book, 'Solid Air | Invisible Killer: Saving Billions of Birds from Windows', highlights decades of his research and summarizes both challenges and solutions.

Every year hundreds of millions of birds die from accidentally flying into glass buildings and windows. But now, new types of glass may make this easily preventable. Daniel Klem, Professor of Ornithology and Conservation Biology at Muhlenberg College in Pennsylvania joins Hari Sreenivasan to discuss creating bird-friendly glass.

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.

Between 365 and 988 million birds die from crashing into windows in the United States each year, according to a new report. That may be as much as 10 percent of the estimated total bird population of the country.