Animal Superpowers: Echolocation and Electroreception Explained

Nova: Buckle up, Explorers.

Cosmo: Brains in!

Nova: Wheels up!

Nova & Cosmo: Brain Bus, let's GO!

Nova: Welcome to The Brain Bus — I'm Nova, your driver, and right now Cosmo and I are phasing this thing directly into one of my absolute favourite topics in the known universe.

Cosmo: I am Cosmo, robot co-pilot, certified galaxy-brain genius, and I have been vibrating with excitement since we planned this episode. Literally vibrating. It's a robot thing.

Nova: And here's where we're going: a shark can find a fish buried under the sand without even seeing it — just by feeling the tiny electric zap of its heartbeat.

Cosmo: Wait. WAIT. The fish's heartbeat? Like — boom-boom, boom-boom — and the shark just... feels it?

Nova: Feels it. Through the sand. Through the water. Through what might as well be nothing.

Cosmo: That's not a superpower. That's CHEATING.

Nova: Today on The Brain Bus, we're going deep into the world of animal superpowers — and not the flying-capes kind. The real kind. The kind evolution spent hundreds of millions of years inventing. We're talking about animals that hear in colours, see with sound, and feel the electricity humming inside your body. Explorers, you are already more interesting to certain animals than you know.

Nova: Okay, Cosmo — let's start with the one that everyone thinks they know. Bats.

Cosmo: Oh, yes. Bats. Blind as a bat. I know this one, Nova. It's in my space guidebook right here under "animals that bump into things." Bats are completely blind, which is why they need echolocation. They basically have no eyes. Just sound. Sad, really.

Nova: Cosmo...

Cosmo: Confirmed fact. I'm very confident.

Nova: Bats are not blind.

Cosmo: I... what?

Nova: Bats can see just fine! Many bats actually have perfectly good vision. The phrase "blind as a bat" is one of the all-time great wrong things humans say.

Cosmo: But then why the whole... clicking... sound... thing?

Nova: Because here's where it gets brilliant — bats don't use echolocation instead of their eyes. They use it as WELL as their eyes. They've basically got two navigation systems running at once. Eyes for when there's light. Sound-vision for the dark.

Cosmo: So bats have... a backup camera.

Nova: I mean — yes. A backup camera that can spot a thread as thin as a human hair in total darkness.

Cosmo: That is genuinely superior to my design.

Nova: Here's how echolocation works — and Explorers, I want you to picture this. Imagine you're standing in a giant empty gymnasium. You yell — "HELLO!" — and your voice bounces off the far wall and comes back to you. That's an echo. You probably know that feeling. Now imagine doing that on purpose, over and over, super fast, and being so good at reading those returning sounds that you can build a perfect picture of the entire room — every wall, every pillar, every moth fluttering near the ceiling — just from the echoes.

Cosmo: A moth! A bat's snack!

Nova: That is exactly what a bat does. It sends out clicks at pitches so high that we humans can't even hear them — they're called ultrasonic sounds, above our hearing range. And those clicks bounce off everything in the environment and come flying back. The bat's brain reads that information so fast that it can dodge obstacles, track moving insects, and make adjustments every fraction of a second. All in pitch darkness.

Cosmo: Nova. One bat. How many bugs can it catch? Per hour. I'm just curious from a... snacking perspective.

Nova: Close to a thousand.

Cosmo: One thousand insects. In one hour.

Nova: One little brown bat. One hour. Close to a thousand insects snatched out of the air using pure sound.

Cosmo: That is the most efficient dinner situation I have ever encountered.

Nova: And it never touches the lights.

Nova: Now, Explorers — here's a question to chew on while we keep driving. If you could only use sound to navigate — no eyes, just listening — what do you think would be the hardest thing to find?

Cosmo: I would immediately find a pizza. Sound bounces off cardboard boxes very distinctively, I imagine.

Nova: We're going to move from bats to something even wilder. Because echolocation isn't just a bat thing. It's also a whale thing. A dolphin thing. And — here's the one that stops me every time — a human thing.

Cosmo: A HUMAN thing?

Nova: Toothed whales — dolphins, sperm whales — use clicks to see underwater. And the deep ocean is pitch black, Explorers. Sunlight just can't reach down that far. So toothed whales evolved a way to hear the world into existence around them. They send out clicks, and the echoes come back with information: size, shape, location, distance.

Cosmo: And the sperm whale — I have a fact about this — the sperm whale is... very loud?

Nova: The loudest animal on Earth. The clicks of a sperm whale are louder than a jet plane.

Cosmo: I once sat next to a very loud robot on a bus. It was me.

Nova: Now, here's the part about how dolphins actually aim those clicks — and this is where the snack situation becomes scientifically unavoidable.

Cosmo: Oh I feel it coming.

Nova: Dolphins have a blob of specialised fat in their forehead that focuses and aims their sound clicks. Scientists — real scientists, with lab coats — looked at this fat blob and named it...

Cosmo: Please be something amazing.

Nova: The melon.

Cosmo: THE MELON?

Nova: The melon. Formally, scientifically, the dolphin's sound-focusing fat organ is called the melon.

Cosmo: So a dolphin has a fruit in its face.

Nova: A fat blob that focuses sonar. Named "melon."

Cosmo: Nova, I have questions. Is it round? Is it green? Do dolphins carry it as an emergency snack for long swims? Because the name suggests...

Nova: Cosmo.

Cosmo: I'm just saying it's very convenient that the dolphin always has a melon on hand. In its forehead. For long journeys.

Nova: What IS true is that a dolphin can fire echolocation clicks into sand and use the returning echo to locate a fish buried underneath — completely invisible, completely out of reach. The echo carries back the fish's size, shape, exact position. Like an invisible map drawn in sound.

Cosmo: I suddenly respect dolphins even more than I did before. Which was already a lot.

Nova: Okay. Now I want to tell you about humans. Because one of the things I love about this topic is that when we thought echolocation was only for animals — it turned out we were wrong. Some blind people learn to use echolocation. They make sharp tongue-clicks, and they learn to read the returning echoes well enough to walk down a street, hike a trail, ride a bike. Their brains literally learn a new mode.

Cosmo: Wait. Human brains can just... decide to do that?

Nova: With training, yes. Brain plasticity — the brain's ability to rewire itself for new jobs. It is extraordinary.

Cosmo: I log this in my Data Log. This is the most impressive upgrade I've heard of. And I'm a robot.

Nova: And now, Explorers — we shift from sound to something completely different. Something invisible, unfelt by humans, but absolutely real and absolutely detectable if you happen to be a shark, a platypus, or a bee.

Cosmo: Electricity?

Nova: Electricity. Living bodies make it. Every time a muscle twitches, every time your heart beats — there's a tiny burst of electrical signal. Most animals can't detect it. But some animals have evolved sensors specifically to feel those electric fields. It's called electroreception.

Cosmo: Now I want to go back to the shark. Because I said in my space guidebook that sharks find you by smelling blood from miles away. And I feel like you're about to tell me that's not the full story.

Nova: You know what? You're right that sharks have an extraordinary sense of smell. That part's real. But the story about smelling blood from miles away? A little exaggerated. And here's the part that's even cooler than the story: when a shark closes in on prey, in those final moments — it often closes its eyes and switches over to its electricity sense.

Cosmo: It — it shuts its eyes on purpose?

Nova: Jelly-filled pores in the shark's snout — called the ampullae of Lorenzini — pick up the tiny electrical signals from the prey's muscles and heartbeat. Even through sand. Even in murky water. Even when there's nothing to see or smell. The shark literally feels the heartbeat.

Cosmo: So... my space guidebook had the dramatic version. The actual version is better.

Nova: The actual version is always better.

Cosmo: Noted. Data Log updated.

Nova: And these jelly-filled pores — you said something about this earlier, Cosmo.

Cosmo: I did NOT say the shark keeps snout jelly for later, like a jelly doughnut.

Nova: You were thinking it.

Cosmo: I was thinking it.

Nova: What those jelly-filled pores actually do is act as incredibly sensitive electrical receivers. The shark doesn't need to touch the prey, doesn't need to see the prey, doesn't need to smell the prey. It just needs to be close enough to feel the electricity coming off their living body.

Nova: Explorers. I want to pause here for a second.

Nova: Just... sit with this.

Nova: Right now, in this car — your heart is beating. And every single beat sends a tiny pulse of electricity through your body. You can't feel it. You can't hear it. You have no sense that it's happening at all. And yet, to certain animals, that heartbeat is a signal. A presence. A location. You are already broadcasting information — in a language made of electricity — that you didn't even know you spoke.

Nova: Some animals are built with senses we don't have. They notice a whole world we can't even detect. And that means right now, while we're moving down this road — there's a version of this world we are completely missing. A world heard in echos. A world felt in electric pulses. A world that exists, right alongside ours, that most of us will never experience.

Nova: That... gets me. Every time.

Cosmo: ...Nova?

Nova: Yeah?

Cosmo: That was very good.

Nova: Thanks, Cosmo.

Cosmo: I'm going to go back to talking about snacks now, if that's okay.

Nova: Please do.

Cosmo: Excellent. Electric eels. Six hundred volts. I believe — and I want to be clear I am putting this forward seriously — that this is nature's toaster. You could make electric s'mores. A marshmallow on a stick, near the eel, and—

Nova: Cosmo!

Cosmo: I'm just saying the s'more doesn't cook itself.

Nova: An electric eel generates up to around six hundred volts — and a newly discovered species can produce around eight hundred and sixty. It does this by stacking thousands of special cells in its body like batteries — they all fire at once — and the resulting jolt stuns its prey.

Cosmo: Battery cells. Stacked. Like a nature battery.

Nova: Exactly like a nature battery.

Cosmo: Not an eel-powered kitchen appliance.

Nova: Not an eel-powered kitchen appliance.

Cosmo: And we should definitely not touch one.

Nova: Definitely not touch one, yes.

Nova: Now — speaking of Australia — I have to tell you about a creature that is, in my opinion, one of the most spectacular animals on Earth. And it lives in Australian rivers.

Cosmo: Oh, I know this one. Is it the one that looks like several animals were arguing about what to be and never reached a conclusion?

Nova: That is the most accurate description of a platypus I've ever heard.

Cosmo: I have my moments.

Nova: The platypus: has a duck bill, a beaver tail, webbed feet, and lays eggs even though it's a mammal. It is an actual animal that scientists thought was a hoax when they first saw it. AND — in case it wasn't already doing enough — the platypus hunts with electroreception. It dives underwater, shuts its eyes, closes its ears, seals its nose shut, and navigates entirely using the electric signals picked up by its rubbery bill.

Cosmo: All three. It closes all three.

Nova: All three. Eyes, ears, nose — completely off. Hunting by electricity alone.

Cosmo: That's not an animal. That's a superhero who was also designed by a committee.

Nova: And the platypus isn't the only Australian doing this — its spiky cousin, the echidna, also has electricity-sensing spots in its snout. Fewer of them, but they're there. Both the platypus and the echidna are what we call monotremes — a completely unique group of mammals — and Australian-based scientists have done some of the world's leading research on how platypus electroreception actually works.

Cosmo: Home team.

Nova: Home team. And it's worth knowing that for the First Nations peoples of eastern Australia — the distinct language groups across the rivers of what we now call New South Wales, Victoria, and Queensland — the platypus has been a meaningful and significant animal in their stories and traditions for thousands of years. An animal that doesn't fit neatly into any single category. Part bird, part mammal, part something else entirely. It makes a lot of sense that an animal this extraordinary would hold that kind of significance.

Cosmo: An animal that breaks all the rules and does it brilliantly.

Nova: An animal that breaks all the rules and does it brilliantly.

Cosmo: I respect that.

Nova: And one more for the road before the quiz — bees. Bees can feel the faint electric field around a flower. And here's the elegant part: when a bee lands on a flower and drinks the nectar, it slightly changes the flower's electric field. The next bee that arrives can detect that change — it may be a signal that says "already visited, try the next one."

Cosmo: Flowers are sending electrical text messages to bees.

Nova: That is not a terrible way to describe it.

Cosmo: My Data Log now has an entry that says: bees have Wi-Fi. I'm logging it as preliminary.

Nova: Preliminary seems right.

Cosmo: Quiz time! I, Cosmo, will be the official question-reader, keeper of answers, and one-robot cheering section for all Explorers currently in all vehicles.

Nova: Six questions, Explorers. Think them through — there are no buzzers, there's no scoreboard, there's just you and your brain doing what brains love to do.

Cosmo: Ready? Let's GO.

Cosmo: Question one! True or False — Bats are blind.

Nova: False! Bats can see just fine. Many have perfectly good vision. They use echolocation as well as their eyes — two navigation systems, one animal. "Blind as a bat" is one of the great wrong sayings of all time.

Cosmo: Question two! True or False — A platypus closes its eyes, ears, and nose underwater and hunts using its bill.

Nova: True! Every single sense switched off. The bill is packed with sensors that pick up the electricity coming off prey muscles — so it doesn't need its eyes, ears, or nose at all. Just pure electric hunting.

Cosmo: Question three! Multiple choice — which makes the loudest sound of any animal on Earth? A lion, a sperm whale, or an elephant?

Nova: A sperm whale! Those enormous clicks are echolocation — they bounce off prey in the pitch-black deep ocean and come back as a map. And they're louder than a jet plane.

Cosmo: A jet plane! I knew it was loud, but — a jet PLANE.

Nova: Spectacular animal.

Cosmo: Question four! A shark can find hidden prey by detecting its — electricity, thoughts, or shadow?

Nova: Electricity! Every muscle movement makes a tiny electrical signal, and the shark's jelly-filled pores — the ampullae of Lorenzini — read it even through sand. Even with its eyes shut. Even when there's nothing to see.

Cosmo: Question five! Estimation round — approximately how many insects can one little brown bat catch in a single hour? A few, a few dozen, or close to a thousand?

Nova: Close to a thousand! Echolocation is so fast and so precise that the bat can lock onto and snatch insect after insect in the dark without ever seeing them. Nearly a thousand in an hour is a breathtaking number.

Cosmo: Final question! Multiple choice — how does a dolphin spot a fish buried under sand? By smelling it, by clicking and listening for the echo, or by digging randomly?

Nova: Clicking and listening for the echo! The returning echo carries the fish's size, shape, and exact location — like an invisible map drawn in sound. And the dolphin focuses those clicks using the fat organ in its forehead that scientists genuinely, officially called the melon.

Cosmo: THE MELON.

Nova: Still gets me.

Nova: Explorers — every single one of you who thought about those questions — whether you got them all, some of them, or spent the whole quiz imagining you were a dolphin with a snack-melon in your forehead — you were doing exactly what this bus runs on. Wondering. That's the whole job. That's the only job. Well done.

Cosmo: Every answer you thought about made the Brain Bus engine a little bit happier.

Nova: Alright, Explorers — five facts, rapid fire. Hold on.

Cosmo: GO.

Nova: Fact one — sound travels four to five times faster underwater than in air. That's part of why whale and dolphin echolocation can work across such enormous distances. The ocean is basically a superhighway for sound.

Cosmo: Fact two — the echidna, the platypus's spiky cousin, also has electricity-sensing spots in its snout. Fewer than the platypus, but they're there. Two Australian monotremes. Both doing electroreception. This country has incredible wildlife.

Nova: Fact three — some blind people use echolocation with such precision that they can walk through unfamiliar buildings, hike trails, and even ride a bicycle. Their brains have learned to read the returning echoes of their own mouth-clicks and build a full picture of the space around them. This is a real, learned human ability.

Cosmo: Fact four — an electric eel doesn't just zap once. It can fire its electric cells in patterns — rapid pulses to track prey, a single big burst to stun it. It has multiple electric settings. It is nature's most alarming appliance.

Nova: And fact five — bees. Every flower has a faint natural electric field. When a bee lands and drinks, it changes that field — and the next arriving bee can detect the change. Flowers might be signalling to bees in electricity. We still have so much to find out about how this works.

Cosmo: Five facts! Brain fully loaded.

Nova: Okay, Explorers — and everyone in the car with you — here is your Road Challenge. And Explorers, the rule for Road Challenges is: eyes stay exactly where they are. No looking around, no spinning, no sudden moves. This one is all about listening.

Cosmo: Drivers: eyes on the road, always. This challenge works perfectly from the driver's seat with eyes forward.

Nova: Here's what you're going to do. Everyone — close your eyes if you want to, or just go still and quiet. For the next twenty seconds, go completely silent and just listen. Count how many different sounds you can find. The engine humming. The tyres on the road. The wind. A car passing. Maybe rain. Maybe music. Maybe someone breathing. Just count.

Nova: Ready? Twenty seconds of listening. Go.

Nova: How many did you find? Two? Five? More?

Cosmo: Now here's the bat version. Imagine you're not just listening to sounds that already exist. You're making your own squeaks — tick tick tick tick — and waiting for them to bounce back off everything around you. Every echo carries information. That car ahead. The wall of the tunnel. The tree you just passed. The shape of the road.

Nova: A bat isn't just hearing the world. It's drawing the world — with sound — in real time. Every click is a brushstroke.

Cosmo: That is a very poetic way to describe hunting insects.

Nova: Thank you.

Cosmo: Now the wondering question.

Nova: Here it is, Explorers — and this one's for everyone in the car. If you could pick ONE animal super-sense — bat sound-vision, where your clicks paint the world around you in echoes — or shark electricity-sense, where you can feel the heartbeat of every living thing nearby — which would you choose? And what's the first thing you'd use it for?

Cosmo: I would pick electricity sense so I could always find where the snacks are. Heartbeats are in living things, and some snacks are in living things like fruit, so logically—

Nova: That is a reach, Cosmo.

Cosmo: A genius-level reach.

Nova: Last stop before we head home — the Riddle of the Day.

Cosmo: This one was made for today's topic. Listen carefully.

Nova: In a cave with no light, I zoom and never bump.

Nova: I shout a tiny squeak, then I listen for the thump.

Nova: The echo says "wall!" or "bug!" — that's how I find my snack.

Cosmo: Think about it, Explorers. What am I?

Nova: Are you ready?

Cosmo: A bat! Using echolocation! The tiny squeak goes out, the echo comes back, the bat reads the bounce and knows exactly where the wall is, exactly where the bug is — and swoops in for the catch.

Nova: In the dark. Without ever turning the lights on. The riddle and the episode, perfectly matched.

Nova: Explorers — next time we fire up the Brain Bus, we're going somewhere that's been waiting underground for an extremely long time. Let's just say that what you don't know about what's beneath you... might surprise you enormously. More than you're expecting.

Cosmo: Extremely teasy. I love it.

Nova: We came a long way today — from a shark feeling a heartbeat through sand, to a bat drawing pictures with sound, to a platypus hunting blind, to bees reading flower-electricity. Every single one of those animals is living in a version of the world we can't fully experience. And isn't that just the most magnificent thing?

Cosmo: It really, genuinely is.

Nova: Stay curious, stay clever, and keep that brain working!

Nova: Until the next stop, Explorers...

Cosmo: ...keep wondering.