Honey bees and hummingbirds can hover like helicopters for minutes at a time, sucking the juice from their favorite blossoms while staying aloft in a swirl of vortices. But the unsteady air flows they ...
Staying aloft when hovering and flying slowly is demanding. According to quasi--steady-state aerodynamic theory, slow-flying vertebrates should not be able to generate enough lift to remain aloft.
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