The remarkable modification in breathing pattern, blood-oxygen binding and flight muscle morphology allows the songbirds to fly at much higher altitudes during long distance flights – as much as 4,000 metres (approximately half the cruising altitude of a commercial jet) above sea level – allowing them to avoid major shifts in temperatures and weather patterns caused by climate change

https://indiaeducationdiary.in/migratory-songbirds-alter-breathing-patterns-for-high-altitude-flight/

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