Birds have sensitive lungs, Canary in a coal mine comes to mind. ... birds respiratory system being so sensitive, it is vitally important that the bird's breat

Birds have sensitive lungs, Canary in a coal mine comes to mind. ... birds respiratory system being so sensitive, it is vitally important that the bird's breath fresh, pure air. Toxins or pollutants in the air can quickly become a major source of problem and even death for the bird: https://cdn.ymaws.com/petsitters.org/resource/resmgr/virtual_library_/how_does_a_birds_lungs_work.pdf https://cdn.ymaws.com/petsitters.org/resource/resmgr/virtual... Air Pollution Kills 10 Million People a Year[1]. Air pollution must impact birds a lot more than humans. [1]https://www.nytimes.com/2022/07/08/opinion/environment/air-pollution-deaths-climate-change.html https://www.nytimes.com/2022/07/08/opinion/environment/air-p...