Recordings of growls, grunts, and screeches in a forest is not convincing evidence.
When I lived up in the hills, one morning at around 2am, me and my neighbors all came out of our houses to figure out who was out in the thick screaming their head off and wailing between the screams. This went on for a good hour or so while we searched deep into the forest with flashlights and rifles, and a few of us had whistles. It sounded like a woman was being tortured, seriously, but we found nothing.
Next day I asked my Maidu friends about it and a couple of the old folks said it was demon spirits, but the rest of them said it was big cats. AKA, mountain lions, cougars, pumas.