How hummingbirds live at high altitudes "New research finds that hummingbird species living at high altitudes have independently evolved hemoglobin with enhanced oxygen-binding properties so they can thrive in oxygen-poor environments." #SciComm by @grrlscientist #birds #ecology #physiology #evolution https://grrlscientist.medium.com/how-hummingbirds-live-at-high-altitudes-69b4761069b1