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RE: Ears! How can we know a where a sound is coming from? Sound localisation.
High frequency sounds are much more directional so the sound level is picked up as loudest in the ear closest to the source of the noise as the head obscures these frequencies casting an acoustic shadow over the ear furthest from the source.
interesting, that must be why bats used high pitched sounds for echolocation
Yeah they wouldn't be able to locate food using bass but they might be able to start some sort of funk acapella group and busk for food. Ultrasonic noise is used in ultrasound scans too.
there are some blind humans who navigate by echolocation.