It also informs other animals that a large creature may be passing by.

Like breaking bones and speech are both informative sounds emitted by a human from which you can learn something about that human condition. The difference between those sounds is more subtle than might appear at first

If a branch falls in the forest and there is no-one there to hear it, does it make a sound?

https://en.wikipedia.org/wiki/If_a_tree_falls_in_a_forest#:~....

"... majority view of the quantum mechanics community then and arguably to this day is that existence in the absence of an observer is at best a conjecture"

"Observer" is the most unfortunate word physicists could have chosen, though. It gets people all confused about observation mistakenly having something to do with thinking or perception. "Interacter" would have been a more accurate term, but it doesn't sound as sexy.

To wit, yes, the tree makes a sound because the tree is there to hear it.

Well yes IF it is true that trees can hear, which is what these new experiments give some credence to but don't prove conclusively

If a tree falls in the forest, all the other trees are there to hear it.