Cover image: Alpine organisms must contend with low temperatures, limited oxygen, and reduced air density. The thick pile and thermoregulatory behavior of bumblebees, coupled with resistance to low oxygen and the ability to fly in reduced-density air, may help explain the prevalence of these insects at high altitudes, where they are crucial pollinators of alpine plants. Pictures taken by Michael Dillon. Male Bombus friseanus and mountain in western Sichuan Province, China. Design by Melanie Frazier and Michael Dillon.
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