I do not know what it is about this video but it is the most "nature is metal" type video I have ever seen.
The monkey absolutely going to town slamming the bird on the post in order to kill it and most likely eat it is something that elicits a response our brains probably haven't experienced since the Ice Age. I think one of the reasons this video seems cursed is because it gives off the exact same aesthetic as the flying monkeys from the Wizard of Oz. The combo of the wings, dark sky, and the monkey give off big Wicked Witch vibes.
When I first watched it I got 2001: Space Odyssey vibes when the apes were smashing the bones.
Just a wild peak into the crazy reality that is mother nature.