Analysis of wind-tunnel data provides details about the creatures’ aerodynamics
The aerodynamic wake left behind a bird in flight is fundamentally different from the atmospheric disturbance produced by a bat, new lab tests suggest. In large part, the disparity stems from the flapping techniques the creatures use as they power their way through the air.
Birds and bats evolved self-powered flight independently, says Anders Hedenström, a biomechanicist at Lund University in Sweden. How is still a mystery: Paleontologists haven’t yet discovered the transitional fossils that represent protobat