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Why can sudden stops and changes in direction help prey escape predators?
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Locomotion
These birds largely reside in coastal areas of North America, although some populations live in the continent's interior along large rivers.
Sudden stops and changes in direction are effective avoidance behavior strategies because they make a prey's movements unpredictable to a predator.1
When a predator is actively tracking and pursuing moving prey, it becomes locked into a specific search pattern. By stopping abruptly or altering direction, the prey forces the predator to shift its focus, which is often difficult to do quickly. In many cases, these maneuvers are so sudden that the predator cannot localize the exact point where the prey has disappeared, especially if the prey uses additional tactics like displaying conspicuous colors that vanish instantly. Ultimately, these erratic movements frustrate the predator's ability to maintain a successful pursuit.1