It’s unclear to scientists why the die-off is occurring, and Desmond said it’s possible it was caused by a cold front that hit New Mexico last week or by recent droughts. Desmond also told KOB the deaths could be related to the wildfires in the West. “There may have been some damage to these birds in their lungs. It may have pushed them out early when they weren't ready to migrate.” The Oregon Department of Fish and Wildlife said on Twitter that “not much is known about the impacts of smoke and wildfires on birds.” #heartbreaking #birds #wildlife https://www.nbcnews.com/news/animal-news/birds-are-dropping-dead-new-mexico-potentially-hundreds-thousands-n1240116