How bats fly described in ScienceNOW and news@nature 10 May 2007 and BBC News 11 May 2007.

Researchers at Lund University, Sweden have studied bats flying through a fine mist in a wind tunnel to find out how they fly. The research turned up some significant differences from the way birds fly. When birds fly, their two wings create swirling vortices of air which join up to form a single loop of air. In bats the vortices associated with each wing stay separate so that each wing operates separately from the other.

Bats and birds also have very different upstrokes. Birds twist and spread their feathers to minimize the effort needed to lift their wings through the air. Bats twist and invert their wings, using the wind against them to create force in a desired direction, similar to the way sailors use wind by manipulating sails.

Bats’ flight is not as aerodynamically efficient as the single vortex formation and feather separation in birds, but it does enable bats to manoeuvre more efficiently at slow speeds.

Editorial Comment: When sailors make use of vortices and air flow to make a boat go in a desired direction, they utilize both creative design to make the sails, and creative manipulation to put them to use. Bats can fly and manoeuvre with much greater control and efficiency than any man-made sailing or flying device, so what is your excuse for not accepting the evidence for creative design in the way bats’ wings work, especially when no one doubts the bats brain creatively manipulates the air to go where it wants?

Evidence News 29 August 2007

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