If you should happen upon a sparrow in the wild, and the sparrow assumes this position, you should realize that you are in extreme danger of sparrow attack.
Stay calm. Avoid looking directly into the sparrow’s eyes. Avoid any sudden movements. Do not attempt to run – a sparrow can easily overtake and pull down a fleeing human. Instead, back away slowly, very slowly, while looking at the ground, as though perhaps looking for seed. Softly whistle a calming tune.