Whales & Dolphins: Ocean Giants for Little Explorers

Nova: Buckle up, Explorers.

Cosmo: Brains in!

Nova: Wheels up!

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

Nova: You're on The Brain Bus - I'm Nova, your driver, and today Cosmo and I are taking you somewhere extraordinary.

Cosmo: I'm Cosmo, robot co-pilot and certified ocean expert - well, mostly certified.

Nova: Explorers, listen to this. The biggest animal that has EVER lived isn't a dinosaur. It's alive right now, swimming in the ocean!

Cosmo: Wait. WHAT?

Nova: We're diving into the deep blue today - whales and dolphins. Hold on tight!

Nova: Okay Explorers, first things first. Cosmo, are whales fish?

Cosmo: Obviously yes! They're huge, they swim, they live in the sea - total fish.

Nova: Ohhh, SO close - but actually, whales are mammals, just like us! They breathe air, they're warm, and whale mums feed their babies milk.

Cosmo: Wait - whales drink MILK?

Nova: They do! And speaking of big - the blue whale is the biggest animal that has EVER lived. Bigger than any dinosaur. And here's the part that made me actually gasp the first time I heard it -

Cosmo: Tell us! Tell us!

Nova: A blue whale's tongue weighs as much as a whole elephant.

Cosmo: ONE tongue?!

Nova: One tongue.

Cosmo: Okay but Nova - if the whale is THAT big, it must eat huge things, right? Like, mountains of giant spaghetti?

Nova: That's exactly what you'd think - but here's the twist. Baleen whales have no teeth at all. Instead, they have stiff, comb-like plates in their mouth - kind of like a giant pasta strainer!

Cosmo: A PASTA STRAINER. In their MOUTH. For catching ocean sprinkles - those tiny shrimp called krill!

Nova: Cosmo has basically described whale feeding perfectly by accident.

Cosmo: I am a genius.

Nova: You're something. Now - because whales are mammals, they have to come up to the surface to breathe. They breathe through a hole on top of their head called a blowhole.

Cosmo: Oh! And they shoot a big fountain of seawater up out of it, right? Like a whale soda fountain!

Nova: It LOOKS like that - but it's really warm air from the whale's lungs, like your breath fogging up on a cold morning. A tiny bit of seawater gets blown up too, which is why it looks like a fountain - but it's mostly just a giant whale sneeze of air.

Cosmo: A whale sneeze. Incredible.

Nova: Now, a baby blue whale drinks SO much thick, rich milk - almost as thick as toothpaste - that it grows the weight of a whole grown-up person every single day.

Cosmo: Every. Day.

Nova: Every day. And some whales live for an incredibly long time. Bowhead whales can live for more than two hundred years - older than your great-great-great-grandparents.

Cosmo: I'd love to ask a two-hundred-year-old whale what it remembers.

Nova: Oh, me too, Cosmo. Me too.

Nova: Now Explorers - this next bit is my absolute favourite. You know what dolphins do in dark water when they can't see?

Cosmo: Flashlights?

Nova: No flashlights. They make clicks - really fast clicking sounds - and listen for the echo to come bouncing back. Scientists call this echolocation - that means using sound to find things. It's like when you shout in a big empty room and your voice comes bouncing back to you. Dolphins listen to that bounce to know what's nearby in the dark.

Cosmo: So they're basically using echo-vision.

Nova: Echo-vision. I like that.

Nova: Explorers - just take a breath for a second.

Nova: Whales and dolphins talk and find their way using sound - because sound travels really far in water and bounces back like an echo. A blue whale's call is so loud, louder even than a jet plane, that another whale can hear it from far across the whole ocean. They're talking to each other across vast distances, in a language made entirely of sound. That's not magic - that's real life.

Nova: One more brilliant thing. A killer whale - or orca - is actually the biggest dolphin in the whole world. Not a whale at all!

Cosmo: My brain just did a somersault.

Nova: And dolphins sleep with only HALF their brain at a time - so the other half keeps them breathing and watching for danger. They never fully switch off.

Cosmo: That is the most robot thing an animal has ever done. I respect it deeply.

Nova: Now, Explorers - here's something special. The Ngāti Porou people [pronunciation: NGAH-tee POH-roh] of Aotearoa [pronunciation: ah-oh-teh-ah-ROH-ah] - that's New Zealand - have kept a treasured story in their family for generations. Before Nova tells it, let me mention: for Māori [pronunciation: MAH-or-ee] people, whales - tohorā [pronunciation: taw-HAW-rah] - are taonga, which means treasures, connected to Tangaroa [pronunciation: tah-ngah-ROH-ah], the guardian of the ocean.

Nova: This story comes to us from the Ngāti Porou people of Aotearoa New Zealand. It has been told for generations. Long ago, an ancestor named Paikea [pronunciation: PIE-KAY-ah] was far out at sea when his canoe was lost beneath the waves. As he struggled in the water, a great whale came to him. Paikea climbed onto the whale's back, and it carried him safely all the way across the huge ocean to Aotearoa. To this day, the Ngāti Porou people honour Paikea and the whale as part of their own family story - and that bond between people and whale is still alive and treasured right now.

Cosmo: A whale that carries someone home across the whole ocean. That's not just a big animal - that's family.

Nova: That's exactly right, Cosmo.

Cosmo: Quiz time! I'm going to ask three questions - shout your answers out, Explorers!

Cosmo: Question one! True or False - whales are a kind of fish.

Nova: False! Whales are mammals - they breathe air, just like us, which is why they swim all the way up to grab a breath through that blowhole on top of their head.

Cosmo: Question two! True or False - a blue whale is bigger than any dinosaur that ever lived.

Nova: True! The water holds up all that enormous weight - a land animal that big would be crushed by its own body. Only the ocean can hold a blue whale.

Cosmo: Ooh, this one's good! Question three - multiple choice! How do dolphins find fish in dark water? Is it - (a) flashlights, (b) making sounds and listening for echoes, or (c) smelling?

Nova: It's (b) - sound and echoes! The click zips out, hits the fish, bounces straight back, and the dolphin knows exactly where that fish is hiding. Every single time you've shouted in a tunnel and heard your echo - you've been doing a tiny version of what dolphins do every day.

Cosmo: Explorers - every single one of you thought hard and that's what the Brain Bus runs on. Well done.

Nova: Fun Fact Blast - four facts, fast as a dolphin!

Cosmo: Fact one! The narwhal's long pointy horn isn't a horn at all - it's a giant tooth poking out through its lip!

Nova: Fact two! Australia has its very own dolphin - the Australian snubfin dolphin - only discovered as its own separate species in 2005, living in warm northern waters!

Cosmo: Fact three! Every year, southern right whales travel to the warm, calm waters along Australia's southern coast to have their babies - and the Mirning [pronunciation: MEER-ning] people of that coast share a deep ancestral bond with those whales that stretches back through all of time.

Nova: Fact four - and this one is wild. An orca lives and hunts in a family group called a pod - and those families stick together and look after each other, just like yours does right now in this car.

Cosmo: Heartwarming AND scientific!

Nova: Okay Explorers - everyone in the car is doing this one together. We're going to become whales!

Nova: Take a slow, deep breath in through your nose - like a whale rising up to the surface of the sea.

Nova: Hold it gently - one… two… three…

Nova: And now blow it out hard through your mouth - big PWOOOOSH - just like a whale's blowhole spout!

Cosmo: PWOOOOSH!

Nova: Beautiful! Whales can hold their breath way, way longer than we can - some can dive down deep for over an hour on one breath.

Nova: Here's your wondering question for everyone in the car - why do you think a whale needs to hold its breath for so long? And where do you think it's going when it dives way, way down into the dark?

Cosmo: Ooh! Riddle time!

Nova: Listen very carefully, Explorers. Here comes your Next-Stop Riddle. I live somewhere that barely any other animal on Earth calls home. I might hop, or bound, or glide, or dig - but you won't find me just anywhere. My home has some of the strangest, most surprising creatures in the whole world - and a lot of them live nowhere else. What place am I from?

Cosmo: Hmm. I have a guess - but Nova says we're not telling yet.

Nova: We are absolutely not telling yet! You'll find out on the very next Brain Bus journey. Keep thinking!

Nova: Explorers, today we dove into the deep blue - we met the biggest creature that has ever lived, we sent our voices out like dolphins to find echoes in the dark, we heard the story of Paikea carried home across the sea, and we learned that a whale song can travel all the way across an ocean.

Cosmo: I'm filing all of this in my Data Log. First entry, wide open: dolphins use sound like an echo - and so do bats, flying in the dark sky! Two totally different animals, one brilliant idea. Filed.

Nova: The ocean is full of wonders, and so are you.

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

Nova: Until the next stop, Explorers...

Cosmo: ...keep wondering.