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A digital particle image of Rufous hummingbird hovering is seen in this
undated handout. Hummingbirds hover by flapping their wings a bit like insects
and a bit like other birds, and now a super-fast camera has made an image of the
technique, scientists reported, June 22, 2005. Researchers used digital particle
imaging velocimetry (DPIV), to study the aerodynamics of hummingbird hovering.
DPIV couples a digital camera that uses a laser light source and a computer to
track circulating microscopic oil droplets seeded in the air. The system allows
scientists to follow the movement of individual particles when air is circulated
by the bird's wings.
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