What's interesting is the source of the graphic-- the National Shooting Sports Foundation, a weapons industry association-- and the reason that the NSSF put it together: to fend off criticism of lead ammunition, which is fatally ingested by a lot of raptors and waterbirds and is threatening to drive the California Condor back into extinction in the wild. Alternatives to lead exist, but, owing to low production of them, they're currently somewhat more expensive.
What's striking about the pie chart is how big a slice of it consists of predation by free-roaming cats. A large new peer-reviewed study published in 2013 estimates the number of North American birds killed by cats at well over one billion per year. Bells on collars don't help. Neutering feral cats doesn't work. Keeping cats indoors helps.