Imaginez vivre durant la période dévonienne, il y a environ 400 millions d'années, lorsque le monde était un endroit totalement différent. Vous seriez entouré de plantes étranges et géantes ainsi que des premières forêts, mais il n’y aurait pas encore de fleurs ou d'herbe. Au lieu d'oiseaux ou de mammifères, le ciel pourrait être rempli de gros insectes géants, et les océans grouillaient de poissons bizarres - certains avec des armures et des mâchoires ressemblant à des ciseaux géants ! C’est aussi l’époque où les premières créatures minuscules ont commencé à ramper hors de l’eau vers la terre. Vous devriez faire attention à ces premiers amphibiens explorant les rivages, mais il n’y aurait encore ni dinosaures ni grands animaux terrestres. Cela ressemblerait à un mélange entre un monde extraterrestre et une jungle préhistorique ! 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.officiel/ 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
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00:00As human beings, we have overcome many challenges, such as glacial periods, serious diseases, or real estate quarrels.
00:08But let's go back much further, to about 400 million years ago,
00:12to a time when the oceans were dominated by marine creatures and where the land was almost devoid of animals.
00:18Do you think you could survive there?
00:20This is the Devonian Period, which began about 400 million years ago and spread over nearly 60 million years.
00:28This period owes its name to the Devonian region in England, where scientists first studied the rocks dating from this time.
00:38At this time, the world was radically different.
00:42The planet had three continents, the supercontinent of Gondwana in the south, a smaller terrestrial mass called the Siberian Kraton in the north,
00:50and the Laurasi in the east.
00:54These continents moved and collided, forming vast mountain ranges.
01:00Now imagine that your time machine breaks down and you find yourself in this ancient and inhospitable world.
01:07You are in a world where the earth is largely a sterile desert.
01:11You are surrounded by archaic plants such as moss and ferns.
01:15This is the beginning of the Devonian Period.
01:17The trees have not yet appeared, but the moss covers the landscape.
01:22And what about the water?
01:24About 85% of the earth's surface is submerged under the ocean during the Devonian.
01:30And you see around you many hot, shallow and low-oxygen lakes.
01:36The first thing you notice is that breathing seems more difficult.
01:40Do not be alarmed.
01:42This is due to a lower oxygen concentration, approaching 19%.
01:47It is enough to start a fire.
01:49And believe me, it could be useful to you.
01:52But wait until you feel a slight dizziness.
01:55Fortunately, there are no big predators to flee.
01:58But you will probably have to swim often to move.
02:02Well, at least the climate has the merit of being quite pleasant, warm and stable.
02:07If you keep moving, you will notice that the landscape seems to extend out of sight.
02:12This is explained by the fact that you are on Gondwana, the largest of the supercontinents.
02:17The movements of the tectonic plates being limited, there are few mountains and the earth seems almost flat.
02:23But not quite flat in reality.
02:25Gondwana housed a huge mountain range comparable to the Himalayas.
02:29This chain was gradually decomposing, releasing sediments into the ocean.
02:34These sediments enriched the waters in nutrients, thus favoring the development of marine life.
02:40One would really believe on another planet in any case.
02:43The landscape around you looks like an aquatic version of Mars.
02:47And the question that remains is, where is all life?
02:53Underwater, of course.
02:55This is not for nothing that we call the Devonian, the era of fish.
02:59In reality, it was not just about fish.
03:02The conditions were ideal for certain forms of primitive marine life to develop important characteristics such as lungs.
03:10Some even acquired the ability to briefly come out of the water to move on land.
03:15So, if you see a small creature resembling a lizard near the coast, avoid crushing it.
03:23It may be one of your distant ancestors.
03:26Well, it's not like you can really walk on it.
03:30Do you remember the illustration of evolution with this being at the head of a crocodile?
03:35This specimen is called Tiktaalik.
03:38As you can imagine, it is one of the first links between fish and terrestrial animals.
03:44And although it may seem harmless, it is actually 2.70 meters long and has sharp teeth.
03:52And yes, it is able to crawl.
03:54So, if you come across a big lizard, it is better to find a hiding place.
03:59You will begin to see more Tiktaaliks as well as other four-legged animals from the medium Devonian.
04:08Let's take a moment to risk our lives and dive under the surface.
04:12What do we have here?
04:13Welcome to a terrestrial version of the game Subnautica.
04:17Although the earth still seems primitive, the diversity of marine life is impressive.
04:22Corals, creatures similar to sponges, seabirds, seashells resembling seashells, and many more.
04:29The oceans are full of varied creatures, just as fascinating as potentially dangerous.
04:34Here are the huge carapace-like placoderms.
04:37And yes, they are all much bigger than you.
04:40These formidable fish have powerful jaws, filled with teeth-shaped serrated plates.
04:45They started out as small mollusk consumers.
04:49But over time, some have evolved to become real monsters,
04:53capable of coming to the end of large fish reaching up to 10 meters in length.
04:57The biggest among them was the Heterosteus, with terrifying eyes.
05:01The Titanic Tee, whose mouth seems ready to swallow you at any moment.
05:05And the most colossal of all, the Dunkleosteus.
05:09Ah, these are names to lay outside, aren't they?
05:11And here are some more modest specimens.
05:14These are the ancestors of sharks, cartilaginous fish.
05:17They had rough scales, rigid jaws, and replaceable sharp teeth.
05:23Finally, we also find tiny ancestors of bonefish,
05:27similar to our modern marine creatures.
05:31These are rather harmless and covered with scales, with very flexible jaws.
05:35You know what? This one could end up in your plate.
05:40But the question is, how are you going to cook it?
05:44There are no trees for fuel yet, at least not before the average devonian.
05:48You should therefore be content to pick up dry moss
05:51and try to rub stones to light a fire.
05:54Luckily, the heat of the climate would prevent you from freezing at night.
05:57But as there is little fuel available,
06:00you might be better served by adopting a raw diet based on mollusks
06:04and other primitive arthropods.
06:06In this world dominated by primitive terrestrial vegetation
06:10and surrounded by a vast ocean,
06:12getting food and resources would be a real challenge.
06:16Perhaps you could focus on fishing or collecting marine elements.
06:21In short, you would have to be very ingenious
06:24to make use of the meager flora available and, who knows,
06:28learn a few tips from marine creatures to navigate the oceans.
06:32Either way, you would have to start all over again.
06:36Surviving the devonians would be a test of size.
06:39Our bodies are not adapted to live underwater
06:42or thrive in an environment largely dominated by the first forms of marine life.
06:47You would also need a shelter.
06:49Perhaps you could try to build a rudimentary structure along the banks
06:53using earth and moss, probably.
06:56You would have to create tools and shelters with the resources at your disposal.
07:01So leave your creativity to chance
07:04and it will be better to get used to living without clothes.
07:07Unless you manage to make an outfit with moss,
07:11shells and fish fins,
07:13quite worthy of the little mermaid.
07:15Okay, okay.
07:17To make the task a little easier for you,
07:19let's imagine that you arrived at the time of the late devonian.
07:23There, we can say that things are improving.
07:26It was towards the end of this period
07:28that the first forests began to appear on Earth.
07:31We now find plants with spores, leaves, roots
07:35and even the first seed plants.
07:38Life settles little by little on the mainland.
07:40Finally, you can breathe normally.
07:43We now have small insects
07:45as well as creatures with four and six legs.
07:48The first terrestrial vertebrates, called primitive tetrapods,
07:51begin to appear.
07:53They are fascinating, being the distant ancestors of mammals
07:57and, finally, humans.
07:59However, beware Houston,
08:01we have a problem.
08:03With the expansion of plants on Earth
08:05and their ability to break rocks thanks to their roots,
08:08huge amounts of nutrients have been released into the water,
08:12triggering a chain reaction.
08:14The oceans are filled with algae,
08:16bacteria have proliferated
08:18and, due to the almost total lack of oxygen in the waters,
08:21about 70 to 80% of the species have disappeared.
08:25Oops!
08:27But good news for you,
08:29there are fewer hungry predators of oxygen in the water.
08:32However, you must now be vigilant
08:34against your new terrestrial neighbors.
08:37Most are not dangerous,
08:39but it is better to stay on your guard.
08:41With the increase of vegetation,
08:43you could make useful tools
08:45like spears, hammers and ropes.
08:48Towards the end of the Devonian,
08:49you could even consider building a cabin in the trees.
08:52Imagine this,
08:53in a world where the first tree ever seen
08:55reaches 28 meters in height
08:57and has an extremely large trunk.
09:00It seems that you could survive without too much difficulty.
09:03You could even adopt a vegetarian diet
09:05with all these options at your disposal.
09:08And, more clothes scratching,
09:10you could create something much more comfortable.
09:13Just be careful
09:14and try not to significantly alter our evolution.
09:18And don't forget that the dinosaurs are on their way.
09:20Until then, enjoy your adventure.