Taille, Forme, Fonction _ Les Yeux Les Plus Ãtranges Du RÃ¨gne Animal

Sympa

Vous êtes-vous déjà demandé qui avait les yeux les plus fous de la bande ? Tout d'abord, nous avons le calmar colossal, le champion poids lourd de la taille des yeux. Imaginez un globe oculaire de la taille d'un ballon de basket : c'est de cela qu'il s'agit. Le tarsier, un primate de la taille d'un enfant, a des globes oculaires plus gros que son cerveau. Tu as déjà entendu parler de la palourde géante ? Ses yeux sont parmi les plus étranges de l'océan : ils peuvent détecter la lumière et l'ombre, ce qui en fait la version sous-marine de lunettes de soleil élégantes. Enfin, nous avons le poisson à quatre yeux, l'ultime multitâche du monde animal. Ces merveilles aquatiques ont des yeux sur le dessus de la tête - oui, vous avez bien entendu. Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com   Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna​ ---------------------------------------------------------------------------------------- Nos réseaux sociaux : Facebook: https://www.facebook.com/sympasympacom/ Instagram: https://www.instagram.com/sympa.offic...  Stock de fichiers (photos, vidéos et autres): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ----------------------------------------------------------------------------------------  Si tu en veux encore plus, fais un tour ici:  http://sympa-sympa.com

Transcript

00:00 The biggest eyes of the animal kingdom belong to the colossal calamar.

00:04 This creature probably has the largest pair of eyes that has ever existed on our planet.

00:10 They can reach an astonishing diameter of 27 cm,

00:14 or the size of a basketball.

00:17 The colossal calamar needs such eyes not only to see its prey better,

00:21 but also to protect itself from underwater predators.

00:24 Its eyes are oriented forward, which gives it a binocular vision.

00:29 Not to be confused with the giant calamar, which has its eyes placed on each side of its head,

00:34 which also allows it to see predators.

00:37 But as it does not have a binocular vision, it is not very good at evaluating distances.

00:42 The colossal calamar, like many other species of calamar,

00:46 has photopores, or luminous organs, one in each eye globe.

00:51 Are they like the headlights of a car?

00:53 These luminous organs are made up of vertical lines, located at the back of the eye globes.

01:00 Despite this rather nice feature, it is unlikely that it has the vision of colors,

01:05 like most animals of the deep sea.

01:07 Indeed, in the depths of the ocean, where it is very dark, they do not really need it.

01:14 Humans, for example, have eyes that can detect light up to a depth of about 500-600 meters, no more.

01:22 As the colossal calamars live more than 1000 meters below the surface,

01:26 they had to adapt to be able to see in almost total darkness.

01:31 That is why they have very large pupils, about 8 cm in diameter.

01:37 This allows them to capture each particle of light in these hostile environments.

01:42 Large eyes are not necessarily synonymous with large bodies, just ask the question to the Tarsier.

01:48 This is a group of primates that has the largest eyes in relation to their size.

01:52 Each of their eyes is as large as their brain.

01:55 These animals are found in the air of Golum in Southeast Asia.

01:59 Because of the size of their eyes, these small animals are not able to make them pivot completely,

02:05 and therefore use their neck to expand their field of vision.

02:09 Like ibus, their neck can pivot by about 100K / 20 degrees on each side.

02:15 Tarsiers are nocturnal animals and use their bizarre eyes to search for their prey.

02:19 They don't make much effort, apart from that, they just wait for the prey to approach them,

02:24 sitting patiently in the dark.

02:27 Speaking of small but effective eyes, some types of ibus have about 28,000 lenses,

02:34 more than any other living animal.

02:37 And as their eyes cover almost all of their head, they have a 360-degree vision.

02:43 Can an animal survive without eyelids?

02:46 Most living beings evolved to have eyelids to protect their eyes from dirt.

02:51 Eyelids also help us in very bright environments or when we are exposed to a strong heat.

02:57 Finally, eyelids contribute to the lubrication of the eyes so that they do not dry out and do not lose their function.

03:05 Nocturnal geckos do not have eyelids, but they have found another unique method.

03:10 They count on their tongue to keep their eyes lubricated and clean.

03:15 They also see very well in the dark because, at night,

03:19 their vision is 350 times more sensitive to color than ours.

03:24 I must admit that I would like to have eyes that change color from time to time.

03:29 Unfortunately for me, I was not born in the Arctic.

03:33 Their eyes can change color depending on the season.

03:36 In summer, for example, their eyes turn golden, while in the coldest months, they have blue eyes.

03:42 The eyes of these animals have adapted and acquired this flexibility

03:46 due to the constant variations in brightness in their hostile habitats.

03:51 Have you ever heard of a four-eyed fish?

03:54 Its official name is "Lanableps" or "four-eyed with large scales".

03:58 It has the ability to see underwater and on water, simultaneously.

04:02 How is this possible? Because its eyes are divided in two by a horizontal line.

04:07 Each of these two eyes has its own pupil and its own retina,

04:11 which means that they can act separately.

04:14 This unique arrangement of its eyes allows fish to see its predators in the sky

04:18 and to spot insects on the ground, which is the essence of its menu.

04:23 The eyes of ostriches are larger than their brains.

04:27 Of all terrestrial animals, they have the largest eyes,

04:31 because they measure about 5 cm in diameter.

04:34 But if you look closely, you will also see that the eyes of ostriches are endowed with long, dense eyelashes.

04:40 These are not really eyelashes, because they are not made of hair.

04:44 These long wicks look more like feathers

04:47 and allow these huge birds to protect themselves against the flying sand and the light of the sun.

04:53 Chameleons are among the most beautiful eyes in the world.

04:57 They have the ability to move independently from each other,

05:00 which allows these reptiles to have a 360-degree vision.

05:04 This reptile can use monocular vision,

05:07 that is, when the two eyes work separately,

05:10 and binocular vision, when the two eyes focus on the same thing.

05:15 We could say that the purple bear has a giant eye.

05:18 Indeed, the entire surface of its body is filled with photoreceptors

05:22 that make it sensitive to light and allow it to see in all directions.

05:28 From time to time, it needs to direct the light to see better.

05:32 The creature uses its thorns to prevent some of the light from reaching its body.

05:40 Some eyes of the animal kingdom have had to adapt to very hot climates,

05:44 as is the case with camels, for example.

05:47 These animals have very long eyelashes that help them protect themselves from the sand.

05:52 The camel's eye also has a third eyelid,

05:55 which extends from one corner of the eye to the other.

05:58 As their environment is filled with small particles of dust,

06:02 they must clean their eyes more frequently than other species.

06:07 Like all other predators,

06:10 ibus have a common characteristic with humans, they can see in 3D.

06:14 Ibus need it to better calculate the distance that separates them from their prey.

06:19 But a question arises.

06:21 How do these gigantic eyes fit into the small skull of an ibus?

06:25 It turns out that these birds had to "redraw" the shape of their eyes.

06:30 The eye of an ibus is not a sphere, it is more elongated.

06:34 The bones of the bird's skull have a special structure composed of sclerotic rings.

06:39 This structure helps to support these huge eyes and to keep them in place.

06:43 It is because of these rings that ibus cannot make their eyes rotate

06:47 and always look straight ahead of them.

06:49 They must therefore use their neck to see around them.

06:53 The ibus probably has the most complex eyes in all of the animal kingdom.

06:59 We humans have only three types of cones in our eyes,

07:03 which allows us to see the colors from red to purple.

07:06 The ibus has 16 types of cones.

07:09 It may not see different colors from ours,

07:12 but it has one of the best color recognition systems ever.

07:16 These ultra-sophisticated color receivers allow them to react very quickly

07:20 to each small change in color, which allows them to avoid predators.

07:24 When you think of animals whose pupils are really unique,

07:28 sheep and goats are not the first on your list, are they?

07:32 You're wrong.

07:33 Goat pupils do indeed have the shape of a horizontal line,

07:37 which is not without utility.

07:40 Data provided by researchers indicate that the shape of the pupils

07:44 and the orientation of the eyes are linked to the daily activities of each type of animal.

07:49 Take the example of large deer predators, like wolves.

07:52 Most of them have their eyes turned forward and their pupils round.

07:56 On the other hand, smaller animals, like snakes, cats or foxes,

08:01 which go for their daily and night food,

08:03 have vertical-slanted pupils, better adapted to night vision.

08:08 The most vulnerable animals, like horses and deers,

08:11 must be constantly on guard.

08:13 They have therefore adapted to have horizontal, large and narrow pupils.

08:18 This allows them to extend their field of vision,

08:20 which is wider than that of any other animal.

08:23 In addition, when they keep their heads down, their eyes turn,

08:26 which allows them to monitor their environment.

Taille, Forme, Fonction _ Les Yeux Les Plus Ãtranges Du RÃ¨gne Animal

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Taille, Forme, Fonction _ Les Yeux Les Plus Ãtranges Du RÃ¨gne Animal