tmosphere, and by a muscular effort, at the same time raising its fered by the air. The downward thrust thus given hinder part. spreading its huge wing-like fins glides rapidly .for- raises the bird or insect and forces it forward; then ward until its momentum is exhausted. Then it drops… … The Wing Spread of the Bat, The Flying Frog of Borneo. NATURE-S FLYING MACHINES,
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