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Growl near Grass Valley, California
A relative of the witness reported hearing heavy breathing outside a trailer and sensing a close unseen presence at the door that made a snarl-like sound.
GrowlUnidentified sound
Possible growling at hikers near the San Gabriel Wilderness
About 15 years before reporting, the witness and a friend paused at a saddle near Smith Mountain while hiking. They heard a very low growl/snuffling sound from tall bushes nearby that they could not see through. Frightened, they left quickly without investigating, and the witness later wondered about the source after seeing nearby reports.
Growl
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