I still look beneath the habitat capping by huge cities out to Phoenix/Gila, passing Brazos plain (Houston-Galveston) and dark satanic mills of Louisiana refineries creating Cancer Alley.
Skimming past the bays of Tampa, and Florida Bay once- Everglades ( a huge sheet river from Okeefenokee to that bay, through the keys.

Some birds, you know cross the Gulf of Mexico and Caribbean . some Terns make 12,000 mile/20,000k journeys yearly.

The loss of flyway habitat (California alone lost 95% of its vital wetlands) LED TO that concentration , however much the atrociously cruel domestic bird/egg food industry played a mutational part of Avian virus emergence.

I repeat for you the ancient Ojibwe caution of Aniishinaabe and the Wolf: “what is done to the one, will also be visited upon the other”

Of COURSE it is. The factors mention in the article – habitat loss and degradation, hunting, and climate change impacts – are all human-caused issues.