Bats, and the art of not stepping on each other

Mixing a live show is mostly about space. When the bass, the kick and the keys all pile into the same frequencies, everything turns to mud, and part of my job is nudging each one into its own lane so you can hear them all. So this week a study about bats made me smile, because it sounds like they've been doing the same thing all along.

Bats find their way by sending out ultrasonic calls, somewhere between 20,000 and 120,000 hertz, far above what we can hear, and listening for the echoes. That works beautifully for one bat. But when lots of bats fly together, how does each one pick its own echo out of everyone else's calls?

Researchers from the University of Toyama, Doshisha, Nagoya and Meiji universities in Japan looked at 11 eastern bent-winged bats. They fixed a tiny wireless microphone to each bat's back, let it fly alone, and played sounds that could clash with its calls, changing their loudness, pitch and timing. The bats shifted the pitch of their own calls in response, and they reacted mostly to lower-pitched sounds, much less to higher ones.

The team then built a simple computer model, inspired by a basic electronic circuit, that adds up recent sounds and lets older ones slowly fade. When they simulated a whole group of bats following that one rule, the bats spread themselves across different pitches. As the lead author, Kazuma Hase, put it, the pattern "can be explained by simple individual rules without relying on central control."

I love that. No conductor, no sound engineer, just each bat listening and making a small move. And the researchers are honest that how bats really avoid jamming each other "is still elusive and actively debated." The next step is testing this in bigger groups and out in the open.

Source: Phys.org, "Call adjustments help bats keep their echolocation signals distinct, study finds" (4 Nov 2026). Paper: Hase et al., Proceedings of the Royal Society B (2026), https://doi.org/10.1098/rspb.2026.0921

Takeaway: Sometimes a good mix doesn't need a mixer, just good listening.