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High-pitched Whistling Heard at Ant Campground
In 1988 at Ant Campground in the Condor Refuge, a report described high-pitched whistling and movement in the chapparal area along Aqua Blanca Creek. No visual contact or further details about the source were provided.
WhistleMovement only
Whistle near Butte County
Loud shrill whistles and chirps followed by low guttural grunts were heard exchanged between one creature above the house and two below, calling and answering.
WhistleChatterGrowl