The Centers for Disease Control and Prevention reports more than 53 million birds across the U.S. have died from highly pathogenic avian influenza, making 2022 the deadliest year since 2014-15 for the disease simply known as the bird flu. The toll is more easily tracked among commercial and domestic poultry. The impact on wild birds is less certain; the CDC’s count of 4,000-plus infected is far from reliable, considering reports of snow geese die-offs exceeding 1,000 in individual waterways and reservoirs in the U.S., including in Colorado.