Thursday, March 20, 2008

लम्बी जीब का कमल ....

Bat held aloft


Hovering in place: A Pallas’ long-tongued bat in flight. Nectar-sipping bats use the same aerodynamic trick that bugs use to hover in place, a study has found. When the bats flap their wings downward they create tiny air cyclones above the wings called a leading vortex which pulls the animals upward and allows them to hover in place.

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