The Snail-Smashing, Fish-Spearing, Eye-Popping Mantis Shrimp | Deep Look

The Snail-Smashing, Fish-Spearing, Eye-Popping Mantis Shrimp | Deep Look

The mantis shrimp is a true heavy-hitter. Take this one. She’s about to devour this snail. But she’s gotta crack it open first. So, she carefully positions it… Then — BAM! — she punches it with the speed
of a .22 caliber bullet. It’s the fastest attack in the animal kingdom. That’s one kind of mantis shrimp, known
as a smasher. Here’s the other. This one’s called a spearer. Buried up to his eyeballs, he watches and
waits. Then springs into action, impaling his prey
on serrated blade with blinding speed, and dragging it beneath the sand. What makes these two so amazing isn’t just
their speed. It’s their eyes. See those black spots? They’re like our pupils, where the light
enters the eye. We humans have one in each eye. Each sends an image to the brain… and voila…
depth perception. The mantis shrimp has six of them. Our vision: binocular. His vision: hex-nocular. For when accuracy counts. As for color? We’ve got 3 receptors, red, green, and blue. The shrimp has 12. Another world record. But there’s even more to this incredible
eye. And it has to do with something called polarized
light. Sunlight is messy. It’s a jumble of wavelengths, moving in
all directions at once. But some surfaces — say the scale of a fish,
or a pair of polarized sunglasses — have a way of changing the light, organizing it,
so it moves in a single plane. We humans can’t really tell this is happening. But the mantis shrimp can make out where in
the ocean light is being polarized and where it isn’t. Some mantis shrimp take this one step further,
and produce their own special kind polarization. And they use it as a kind of secret code. See, mantis shrimp are incredibly territorial. They will defend a burrow to the death. But some, like our smasher, have a way of
avoiding the fight. When he looks into a burrow, he can tell that
another mantis shrimp has already claimed it, by the way light is hitting its body. That’s the secret code. Here’s how it works. Remember when I said that polarized surfaces
organize light into a plane? Well these surfaces on the mantis shrimp make
the beams of light circular, spinning through space like a helix. And as far as we know, only other mantis shrimp
can can detect this with their eyes. You can see it here because we put a polarizer
on the camera. So, these shrimp have taught us a thing or
two. By reverse engineering the mantis shrimp’s
eye into a camera, a group of scientists have begun to use polarized light to diagnose injuries
and disease. This scanner measures polarization in red. See how this mouse tissue goes red when it
stretches? Well, injuries to our tendons do the same under the scanner. So do some cancers. This endoscopy footage reveals cancerous cells
hiding in plain sight by the way they react to polarized light. It just goes to show how we see the world
differently when we look at it through another set of eyes. Hi, It’s Amy. I wish I could say that no snails were harmed
in the making of this video. But a shrimp’s gotta eat. And so do we! So subscribe. See you next time.

100 thoughts on “The Snail-Smashing, Fish-Spearing, Eye-Popping Mantis Shrimp | Deep Look

  1. Those black spots ARE NOT PUPILS, they're an optical illusion. They don't only have 6 "eyes", they have HUNDREDS of lens per eye. Come on, PBS, fact check your stuff, PLEASE!

  2. hey! those are pretty stereotipical sayings about us!

    we could also morbidly terrorize those snails before we eat their insides

  3. How a simple camera recognize 3 main colours can't created by chance and a eye's shrimp can recognize more than main 10 colours came by chance and randomly ??! OMG

  4. brooo they took the theme in the first 30 secs of the video from the bug gym in pokemon black and white 2😱

  5. fun fact: those black spots aren't actually irises but "pseudo-irises" wich are purely cosmetic. The eyes are in fact compound eyes, much like a common fly. The same phenomenon can be observed with most mantises.

  6. So Cute ! 1:26
    It would be cool to make hex-nocular, ultra wide range 12 color night vision / UV goggles for people to see in a new way.

  7. wow – the fact that lifeforms found a way to adapt themselves to make use of light that effienctely just screams awesome

  8. DK why the description especially the “fish spearing” reminds me of spongebob about the hash slinging slasher

  9. I saw one of these fckers yesterday in a tide pool. I tried poking it with a stick. When the tip was close to its face it punched the stick and i felt its power. Thinks its safe to say that this shrimp is indeed a one punch shrimp

  10. I'm in love with this channel!! I wish these videos were much longer! Most videos I wish were shorter but on this channel; I could watch it on end and never get bored!!

  11. Not actually hexnocular, as the black spot is only where the ommatidia are in line with the camera view. The mantish shrimp is using the double eye to calculate a quadnocular vision, using the 5 band central part to see polarized light in 9 up to 13 light bands.

  12. I will forever be in awe of these animals and the way they've evolved to survive. Humans just can't compete!!

  13. Mantis shrimp is cool, but put too many skill points into vision, not enough into intelligence. One of the worse uses of an abundance of skill points in the entire meta.

  14. We extremely thank those loony atheists for producing such stunning nature documentaries that increase and strengthen our believes in existence and wisdom of the almighty Allah.

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