I'm wondering if there are any common principles for how animals gauge the distance of a sound source. How to differentiate between a close, soft sound and a loud distant sound?
For example, hypothetically, if you alternately played back the same sound from two identical speakers, one 10m away from the focal animal and the other 50m away, with volumes such that the sounds arrive at the animal at equal amplitude - would the animal have any way to tell them apart?
My hunch is that attenuation of higher frequencies would have something to do with it, and maybe the relative level of echo ('wet') to 'dry' signal. Thoughts?