The Greater Honeyguide, a Bird That Understands Humans
audubon.org
audubon.org
It copies not just the songs of other birds, but man-made sounds as well! Check out the link, it's mindblowing.
I'm a David Attenborough fan, but in the interest of accuracy, this has to be made known. That video segment was made in the older days of natural history documentary where some artistic license was taken.
[1] "Lyrebirds mimicking chainsaws: fact or lie?" [ https://theconversation.com/lyrebirds-mimicking-chainsaws-fa... ]
Edit: the article that you linked mentions that they have a range of metallic sounds in their vocab already, so I assume they've just copied the pitches and patterns distinctive to people walking with a trad rack. Still off-putting when you hear it for hours and the entire gorge can be traversed in about 20 minutes and is completely visible from a couple of pitches up a climb. You tend to assume that there's another climbing party aimlessly wandering in circles just out of sight!
"...there is a lot of misery, the same misery that is all around us.."
Perhaps you mean that humans are pure evil, given the other ways we treat animals and plants and other living things in this, our only home.