The genus Bombus consists of over 250 species of large, nectar-loving bumblebees. Their bright coloration serves as a warning to predators that they are unwelcome prey and their bodies are covered in a fine coat of hair—known as pile—which gives them their characteristically fuzzy look. Bumblebees display a remarkably capable flight performance despite being encumbered with oversized bodies supported by relatively diminutive wings.
….In their recent study published in the journal Biology Letters, Dillon and Dudley state “all bees successfully hovered at air pressure equivalents exceeding 7,400 m, three flew above 8,000 m, and two flew at air pressures corresponding to altitudes higher than the peak of Mt. Everest.”