# How do animals defend themselves?

An episode of [Science for Kids / Science's Not Boring: The Kids Science Podcast](https://invisiblenetwork.ai/podcast/1896928296), 22 Sep 2026, 11 min.

Audio: https://www.buzzsprout.com/2624612/episodes/19807840-how-do-animals-defend-themselves.mp3

In the wild, nobody wants to become someone else's dinner! But how do small creatures stay safe from hungry predators? Join Mira and Finn on a wild adventure to uncover the most mind-blowing and explosive animal defense mechanisms on the planet! Did you know there is a mammal covered entirely in giant fingernail-like scales? Discover the amazing Pangolin, an animal that rolls into a heavy, razor-sharp ball of armor! We will also bust a massive myth about the North American Porcupine and its 30,000 spiky quills. But wait, it gets even crazier! Prepare to be shocked by the Bombardier Beetle, a tiny insect that shoots a boiling hot, toxic chemical spray out of its bottom to blast away attackers! Plus, dive underwater to see how clever squids create gooey, fake bodies out of ink to trick sharks. Finally, meet the absolute wildest reptile of all—the Texas Horned Lizard, which literally squirts foul-tasting blood right out of its eyeballs to scare off coyotes! Packed with wild facts, gross science, and an awesome quiz, this episode proves that science is definitely not boring!

## Transcript

[0:00] SPEAKER_00: Welcome to Science Is Not Boring by Kidopoly.com.
[0:03] SPEAKER_00: I'm Mira! And I'm Finn! Before we dive into today's wild adventure, we have a very special birthday to celebrate.
[0:12] SPEAKER_00: A very happy ninth birthday to Remy in Melbourne, Australia.
[0:17] SPEAKER_01: Happy birthday, Remy! Everyone here at Kidopoly hopes you have a wonderful birthday celebration.
[0:23] SPEAKER_00: And Remy, you specifically asked for an episode about animal defences, so this one is just for you.
[0:30] SPEAKER_00: Great pick, Remy.
[0:32] SPEAKER_01: Wait, animal defences?
[0:34] SPEAKER_01: Like how animals use swords and shields in the wild.
[0:38] SPEAKER_00: Well, they don't have metal swords, but their bodies have weapons that are even cooler.
[0:44] SPEAKER_00: Imagine an insect that shoots a boiling chemical spray from its bottom.
[0:49] SPEAKER_00: Or a lizard that squirts blood out of its eyeballs.
[0:53] SPEAKER_01: No way! Blood from its eyes?
[0:56] SPEAKER_01: That sounds a little gross, but also totally awesome.
[1:00] SPEAKER_00: In the wild, everyone needs a way to stay safe from hungry predators.
[1:04] SPEAKER_00: Today, we are discovering the astonishing bag of tricks animals use to avoid becoming someone's dinner.
[1:11] SPEAKER_00: From spikes and armour to squirting ink.
[1:14] SPEAKER_01: So if a small animal is about to get eaten, they can't exactly run inside and lock the door.
[1:19] SPEAKER_00: Exactly! They have to carry their defence with them everywhere.
[1:24] SPEAKER_00: Let's start with heavy armour.
[1:26] SPEAKER_00: Imagine wearing a suit of armour that makes up 20% of your total body weight.
[1:32] SPEAKER_00: That would be so heavy! What animal wears that?
[1:35] SPEAKER_00: The pangolin! They live in the forests and grasslands of Asia and sub-Saharan Africa.
[1:42] SPEAKER_00: They are the only mammals in the world completely covered in tough, overlapping scales.
[1:48] SPEAKER_00: What are the scales made of?
[1:50] SPEAKER_00: Are they like dragon scales or rocks?
[1:52] SPEAKER_00: They are made of a protein called keratin.
[1:55] SPEAKER_00: That is the exact same material that makes up your fingernails and your hair.
[2:00] SPEAKER_00: Wait, so they are basically covered in giant fingernails?
[2:04] SPEAKER_00: That is hilarious! It sounds funny, but it is incredibly strong.
[2:09] SPEAKER_00: The African giant ground pangolin can weigh up to 33 kilograms, meaning its scale armour weighs over 6 kilograms alone.
[2:19] SPEAKER_01: So what happens when a hungry lion tries to take a bite out of one?
[2:22] SPEAKER_00: The pangolin instantly rolls up into a tight, impenetrable ball.
[2:27] SPEAKER_00: The scales overlap perfectly like roof tiles, protecting their soft belly.
[2:32] SPEAKER_01: But what if a predator tries to pry them open with its paws?
[2:36] SPEAKER_00: That is a terrible idea.
[2:38] SPEAKER_00: The pangolin can perform a sharp slicing motion with those scales.
[2:43] SPEAKER_00: If a predator sticks a paw in there, it gets a nasty deep cut.
[2:47] SPEAKER_01: Wow, so their giant fingernail armour is also a secret weapon.
[2:51] SPEAKER_01: Okay, armour is great, but what about spikes?
[2:54] SPEAKER_01: Like porcupines?
[2:56] SPEAKER_01: Do they really shoot their spikes like arrows?
[2:59] SPEAKER_00: I am so glad you asked, because that is a huge science myth.
[3:04] SPEAKER_00: The North American porcupine does not shoot its spikes, which are actually called quills.
[3:10] SPEAKER_01: They don't shoot them?
[3:11] SPEAKER_01: Then how do they defend themselves against bears or coyotes?
[3:14] SPEAKER_00: An adult porcupine is covered in about 30,000 of these sharp quills.
[3:20] SPEAKER_00: When a predator gets too close, the porcupine puffs them all up to look massive.
[3:25] SPEAKER_01: 30,000 quills?
[3:28] SPEAKER_01: That is an unbelievable amount of spikes on one animal.
[3:31] SPEAKER_00: And here is the genius part.
[3:33] SPEAKER_00: The quills are very loosely attached to the porcupine's skin.
[3:37] SPEAKER_00: If a predator bites down, the quills pop right out and stick directly into the predator's face.
[3:43] SPEAKER_00: Ouch! But why can't the predator just pull them out like a wooden splinter?
[3:47] SPEAKER_00: Because porcupine quills have a hidden secret.
[3:51] SPEAKER_00: Scientists examined them under microscopes and discovered microscopic, backward-facing barbs on the tips.
[3:58] SPEAKER_01: Barbs?
[3:59] SPEAKER_01: You mean like the little hook on the end of a fishing line?
[4:02] SPEAKER_00: Exactly.
[4:03] SPEAKER_00: There is a tiny 1 to 5 micrometer space between the tip of each barb and the shaft of the quill.
[4:10] SPEAKER_00: These barbs make the quills slide into skin easily, but they act like tiny anchors when you try to pull them out.
[4:17] SPEAKER_00: That is absolutely brilliant, but it sounds super painful for the coyote.
[4:21] SPEAKER_00: It is.
[4:22] SPEAKER_00: And fun fact, those hollow quills also help the porcupine swim.
[4:27] SPEAKER_00: They trap air inside, so the porcupine floats like it is wearing 30,000 tiny life jackets.
[4:34] SPEAKER_01: Okay, spikes and armour are cool, but you mentioned an insect that shoots a boiling chemical spray.
[4:40] SPEAKER_01: I need to hear about this immediately.
[4:43] SPEAKER_00: You are talking about the famous Bombardier beetle! There are over 500 species of these beetles, and they have the most explosive defence mechanism in nature.
[4:53] SPEAKER_00: Explosive?
[4:55] SPEAKER_00: Do they literally blow up like a firecracker?
[4:58] SPEAKER_00: Not themselves.
[4:59] SPEAKER_00: Inside the beetle's tiny abdomen, hydrogen peroxide and a chemical called hydroquinone are stored safely together in one storage chamber.
[5:09] SPEAKER_01: What happened when an ant or a hungry frog attacks the beetle?
[5:13] SPEAKER_00: The beetle squirts this mixture into a second, heavily reinforced reaction chamber containing special catalyst enzymes.
[5:21] SPEAKER_00: When they mix, a violent chemical reaction happens instantly.
[5:26] SPEAKER_00: What does the reaction do?
[5:28] SPEAKER_00: It produces expanding oxygen gas and intense heat.
[5:33] SPEAKER_00: In a fraction of a second, the liquid reaches 100 degrees Celsius.
[5:38] SPEAKER_01: Wait, 100 degrees Celsius?
[5:41] SPEAKER_01: That is 212 degrees Fahrenheit.
[5:44] SPEAKER_01: That is literally the temperature of boiling water.
[5:47] SPEAKER_00: Exactly! The beetle aims a flexible nozzle at its back end and fires this boiling toxic liquid directly at the attacker with a loud popping sound.
[5:57] SPEAKER_01: A toxic chemical cannon on its bottom.
[6:00] SPEAKER_01: That is the wildest thing I have ever heard.
[6:03] SPEAKER_00: It gets crazier! A scientist named Professor Christine Ortiz at MIT used high-speed X-ray cameras to look inside the beetle.
[6:12] SPEAKER_00: She discovered it doesn't just shoot one solid stream.
[6:16] SPEAKER_00: What does it do instead?
[6:18] SPEAKER_00: It fires in rapid, microscopic pulses.
[6:21] SPEAKER_00: A single blast can contain up to 20 pulses, firing at a frequency of 500 times per second.
[6:29] SPEAKER_00: This keeps the beetle from burning its own chamber.
[6:32] SPEAKER_01: The bombardier beetle is my new favourite animal! But wait, you also mentioned squids vanishing in ink and the lizard shooting blood.
[6:41] SPEAKER_00: Let's do the squid first.
[6:43] SPEAKER_00: When a reef squid or a cuttlefish is threatened by a predator like a shark, they squirt a massive cloud of ink from a special organ called an ink sac.
[6:52] SPEAKER_01: Does the ink just blind the shark so the squid can swim away?
[6:56] SPEAKER_01: Sort of.
[6:57] SPEAKER_00: The ink contains melanin, the exact same pigment in human hair, plus a thick mucus.
[7:04] SPEAKER_00: Sometimes the squid shapes the ink cloud to look exactly like its own body.
[7:10] SPEAKER_00: Whoa, like a dark, gooey decoy.
[7:13] SPEAKER_00: Yes, it is called a pseudomorph, which means fake body.
[7:18] SPEAKER_00: The shark attacks the ink dummy and the real squid jets away safely.
[7:23] SPEAKER_01: Haha, that is a magic trick.
[7:26] SPEAKER_01: Okay, now tell me about the blood-shooting lizard.
[7:29] SPEAKER_01: I have been waiting for this.
[7:31] SPEAKER_00: Meet the Texas horned lizard.
[7:34] SPEAKER_00: It's a flat, spiky lizard that lives in the deserts of North America.
[7:38] SPEAKER_00: If a coyote corners it, the lizard uses its ultimate defence, called ocular auto hemorrhaging.
[7:46] SPEAKER_01: I don't know what that fancy science word means, but it sounds super dramatic.
[7:51] SPEAKER_00: It means it shoots blood from its eyes.
[7:54] SPEAKER_00: The lizard deliberately increases the blood pressure inside its head until tiny blood vessels in the corners of its eyes literally burst.
[8:03] SPEAKER_01: That is completely gross, but I am fascinated.
[8:07] SPEAKER_01: How far can it shoot the blood?
[8:09] SPEAKER_00: Up to five feet away.
[8:11] SPEAKER_00: That is 1.5 metres.
[8:14] SPEAKER_00: Imagine a tiny lizard hitting a target from across a whole picnic table.
[8:19] SPEAKER_00: But why does the coyote even care about getting splashed with a little blood?
[8:23] SPEAKER_00: Because it tastes absolutely vile to canines.
[8:26] SPEAKER_00: The lizard eats venomous harvester ants, and it concentrates the bad tasting chemicals in its blood.
[8:34] SPEAKER_00: It tastes so terrible that coyotes run away instantly.
[8:38] SPEAKER_00: Alright Finn, quiz time.
[8:40] SPEAKER_00: Are you ready?
[8:41] SPEAKER_01: Bring it on.
[8:42] SPEAKER_01: I'm ready to blast these questions like a bombardier beetle.
[8:46] SPEAKER_00: First question.
[8:47] SPEAKER_00: What protein makes up both pangolin scales and porcupine quills?
[8:54] SPEAKER_00: Next one, what percentage of a pangolin's body weight is made up of its armour?
[9:03] SPEAKER_00: Question three.
[9:04] SPEAKER_00: How many quills does an adult North American porcupine have?
[9:12] SPEAKER_00: Here's number four.
[9:13] SPEAKER_00: What exact temperature in Celsius does the Bombardier Beetle spray reach?
[9:22] SPEAKER_00: Last question.
[9:24] SPEAKER_00: How far can the Texas horned lizard shoot blood from its eyes?
[9:31] SPEAKER_00: Great job, let's see how you did.
[9:34] SPEAKER_00: The first answer is keratin, the exact same stuff in your fingernails.
[9:40] SPEAKER_00: For question two, a whopping 20% of its body weight.
[9:44] SPEAKER_00: Number three, the answer is around 30,000 quills.
[9:49] SPEAKER_00: Question 4, it reaches 100 degrees Celsius, which is boiling hot.
[9:55] SPEAKER_00: And the final answer is up to 5 feet or 1.5 metres.
[10:00] SPEAKER_00: Animals really do have the most incredible ways of staying safe.
[10:05] SPEAKER_01: Yeah, from rolling into a keratin ball to shooting boiling beetle juice and making ink dummies.
[10:11] SPEAKER_01: Science is definitely not boring.
[10:13] SPEAKER_00: If you loved learning about the explosive Bombardier Beetle, please go drop an explosive five-star review on our podcast.
[10:22] SPEAKER_00: Just scroll down on your app and tap the stars.
[10:25] SPEAKER_01: Oh, and don't forget to check out our site kidopoly.com.
[10:28] SPEAKER_01: We've got tons of fun learning games and activities there.
[10:32] SPEAKER_00: We definitely do.
[10:33] SPEAKER_00: And if you want to shout out on the show like Remy, or just want to say hi, email us at hello at kidopoly.com.
[10:41] SPEAKER_01: See you next time on Science is Not Boring.
[10:44] SPEAKER_00: Bye, everyone!

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