Our neighborhood is frequently visited by street vendors, each with a unique sound that alerts residents that they are nearby. The sweet potato vendor only comes at night and his calling card—a piercing whistle—is perhaps the most distinctive of all. We’ve been on the hunt for this elusive prey since we first started visiting this area, and while it’s not perfect, this video at least captures the whistle sound in full.

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Why a steam whistle signals snack time in Mexico City
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