What is the most reliable sensory clue for locating an obscured Belted Kingfisher?

Answer

Hearing its loud, distinct, mechanical-sounding rattle call

Belted Kingfishers are notoriously wary and prone to flying or diving away upon the slightest disturbance, making direct visual spotting difficult, especially when dense streamside foliage obscures the view. Because of this wariness, listening often proves more effective than looking. The most reliable indicator of their presence is their unique vocalization: a loud, distinct, mechanical-sounding rattle. Hearing this sharp sound echoing, often given during flight or when perceiving a threat, allows an observer to immediately stop moving and carefully scan the bankline or overhanging dead branches where the bird is likely perched for hunting.

What is the most reliable sensory clue for locating an obscured Belted Kingfisher?
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