Since the die off started before the cold spell and is continuing after, another causative factor must be involved. Wildfires are known to force early migration, as well as poison the atmosphere and obscure visibility. Jon Hayes of Audubon Southwest says the die-off and wildfires are symptoms of global climate change. “All these things are going to cause long-term declines, long-term losses [of birds], and they’re gonna be punctuated by big scary events like this. It’s part of this bigger problem.” A 2019 study by Cornell University found that North American has lost some 50 billion birds. The study concluded that 389 bird species, some of which have been killed in the current disaster, are threatened with extinction as weather patterns change and become more extreme due to planetary heating.
Researchers are planning to send some of the bird carcasses they have collected to US Fish & Wildlife's forensic laboratory in Ashland, OR. The necropsy reports will take a week or more to provide possible answers to the factors causing their deaths. Researchers are asking the public to be on the lookout for dead or disoriented migratory birds and report what they find to state wildlife departments or report on the iNaturalist website.