Thousands of Mexican free-tailed bats use this flood-control tunnel near the Arizona Canal during the warm season, emerging around dusk in a dense stream. Visitors should remain behind fencing, stay on the public path and never enter the drainage channel or handle bats.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: maricopa.gov/DocumentCenter/View/76991/Phoenix-Bat-Cave-Instructions