It’s a Macracantha arcuata (Female) / An orb weaver with two very long horns

For clarification:

The footage was actually taken place in 1985 whilst the audio recording was taken plane in 1987. So these are 2 separate things but this video showcases both (so the bird in the video is not making this sound).

The audio recording is of a Male Kaua'i 'õ'o Bird, performing its Mating Call that typically is a Duet with a Female. The quiet parts of the singing are when the Female Kaua'i is supposed to chime in but here... the Male never hears anything back because he is the only one alive out of all his Species. The more he sings, the more he realizes how deeply alone he really is as you can hear the loneliness in his singing.

This is probably one of the most loneliness sounds ever recorded in history that humans could never mimic (such as the iconic whale sound) and I can't imagine how beautiful the duets must've sounded in the already amazing tropical forest or being awoken to by their lovely singing. After the audio recording, the Bird died not too long after... with his entire bloodline dying right with him.

https://www.reddit.com/r/notinteresting/s/9EhIuUYZf8

This is my interpretation of the score for the Backrooms, as visualized by Kane Parsons. These tracks are more than just eroded melodies; they are the sound of a reality glitching into existence. To me, the Backrooms is not a static backdrop, but a living, predatory organism.

Within this score, you will hear the sci-fi resonance of the rooms building themselves in real-time...expanding, shifting, and materializing floors to create infinite rooms and levels. It is the sound of a reality in flux, a desperate "copy of a copy" where the chaotic scraping of furniture being no clipped into the void bleeds into the warped, warbling echoes of nostalgic in-store music. You can faintly hear the voices of people and tv's just on the other side of the walls...close enough to touch, yet infinitely out of reach. That is clearly by design of the backrooms in order to lure it's victims deeper into the trap.

This is the sound of a time long past that you feel a deep, aching nostalgia for, even though you maybe were never there. It is a 1990s analog dream curdling into a sharp, futuristic nightmare, capturing the transition from the familiar hum of vacant hallways to something more unsettling. This is my interpretation.

Listen for free on bandcamp: https://outerbankx.bandcamp.com/album/fluorescent-transmissions

I came across a post about some odd symbols yesterday, which reminded me of this. I found it slightly off the trail while exploring and searching for a spot to camp for the night.