Shadowing Practice: What If the Titanoboa Never Stopped Evolving for 55 Million Years? - Learn English Speaking with Video

Elige un modo de práctica

Cada modo abre una sala de práctica a pantalla completa.

181 oraciones
Si las oraciones son demasiado cortas o largas, haz clic en Editar para ajustarlas.
1
This is the Titanoboa, one of the largest and deadliest snakes to ever exist.
2
It went extinct 55 million years ago.
3
But what if that never happened?
4
What if the Titanoboa just kept evolving and was alive today?
5
What special traits would this deadly creature have?
6
And how big could it get?
7
This is What If?
8
And here's what would happen if the Titanoboa never stopped evolving.
9
Okay, before we look at the modern-day Titanoboa, we need to go back.
10
60 million years ago, the Titanoboa lived in the tropical waters of South America, arriving on the scene after the dinosaurs went extinct.
11
It was a major predator of its time.
12
This snake was unimaginably large.
13
It had a girth of about one meter.
14
That means if it were slithering on the ground toward you, it would come up to your waist.
15
It was 14 to 15 meters long and it weighed over 1,000 kilograms.
16
Luckily the Titanoboa wasn't venomous, but don't let that trick you into believing it was safe.
17
It had a different way of killing its victims, by squeezing the life out of them.
18
Literally.
19
By wrapping itself around your body, or squeezing your windpipe, and then swallowing you whole.
20
And if you tried to slip out, you'd be met with rows of sharp little teeth that would dig into you.
21
But you could see this creature coming, right?
22
No, not a chance.
23
The Titanoboa was the perfect color.
24
A color that allowed it to camouflage itself in its swampy environment.
25
it would sit and wait for the perfect moment to strike.
26
It feasted mainly on fish, turtles and crocodiles.
27
So if the Titanoboa was so dominant, what finally made it go extinct?
28
Well, it had to do with a massive change in climate.
29
But to understand this, let's first dive into what made the Titanoboa such a dominant creature, and then how it suddenly went extinct.
30
Paleocene, 66 million years ago to 56 million years ago.
31
Titanoboas emerged after the apex predator niche was left empty by the extinction of the dinosaurs.
32
They thrived in hot and humid environments.
33
Lucky for them, that's what Earth happened to be like 60 million years ago.
34
The average temperature was around 24-25 degrees Celsius.
35
We love that temperature in the summer, but imagine if it were that way the whole year.
36
Instead of ice caps, the poles were covered with forests.
37
And instead of polar bears, there were alligators roaming around.
38
Just like today, a planet even a few degrees hotter is very unpleasant for human beings.
39
So it's a good thing we weren't around at that time.
40
But there's a set of animals that thrive in the heat.
41
Cold-blooded ones.
42
Our Titanoboa was cold-blooded, so it loved warm weather.
43
Unlike warm-blooded creatures, cold-blooded animals aren't able to regulate their own body temperature.
44
They use heat from the environment to warm up their bodies and kick their metabolism into a higher gear.
45
So a warmer Earth was perfect for the Titanoboa.
46
It had a supply of external energy to keep its body warm, hunt without mercy, and become one of the largest predators ever.
47
But then the Titanoboa went extinct.
48
Why?
49
Well, a lot of changes were happening at this time.
50
The Earth experienced two very different climate shifts.
51
First it became very hot, and then it cooled down.
52
With our current evidence, it's not clear if the Titanoboa became extinct during the heat spike or during the cooling phase.
53
So let's look at each change and try and figure out what might have happened.
54
The heat spike event, 56 million years ago.
55
It was 56 million years ago that Earth suddenly got super hot.
56
The official name for this heat spike is the Paleocene-Eocene Thermal Maximum, or PETM for short.
57
Massive amounts of carbon dioxide entered the atmosphere, raising the temperature by up to 8 degrees Celsius.
58
The seas became really hot.
59
In the tropics, it was like a warm bathtub with temperatures around 38 degrees Celsius.
60
was a mass extinction of creatures in the deep sea.
61
In particular, many single-celled creatures called thorums died out.
62
For the Titanoboa, this may have resulted in two different outcomes.
63
It's possible that this giant snake thrived in hot water and became larger.
64
Even if some fish were dying, other reptiles like turtles and crocodiles could have also grown big with the heat
65
and became a great food source for the Titanoboa.
66
So in this scenario, or Titanoboa just gets bigger and badder during the heat spike.
67
But there's another possibility.
68
Maybe the Titanoboa went extinct due to the warmer temperatures.
69
Because the heat spike was so sudden, oceans absorbing carbon dioxide would have become more acidic.
70
Many fish may have died in that acidic warm water, which would have meant fewer fish for the Titanoboa to eat.
71
Now, if this were the case, the Titanoboa would have needed to adapt to survive.
72
What evolutionary change could have helped it survive this heat spike?
73
Well, if the tropical waters were too hot and acidic to live in, moving onto land would have been Titanoboa's best bet.
74
Yeah, switching from a mostly pescatarian diet to being a meat eater.
75
Now as Earth became warmer, something interesting was happening.
76
the waterline, the land was exploding with different types of mammals.
77
Camels, horses, pigs, goats, and giraffes all evolved when Earth was a giant sauna.
78
So if Titanoboa moved from water to land, it would have found some new foods to keep it going.
79
But because of its large size, living on land would have been difficult.
80
So our Titanoboa would need a different kind of adaptation to get through this temperature spike.
81
The giant snake is going to get some stronger swimming muscles and swim up to the poles.
82
Because now, the poles have warmed up so much that they're tropical.
83
The ice melted into water, and the polar seas were full of crocodiles.
84
The perfect lunch for a hungry titanoboa.
85
Eocene and Oleocene, 56 million years ago to 23 million years ago.
86
Okay, after 200,000 years, the heat spike was finally over, and temperatures went back to what they were before.
87
But another major shift in climate is on the way.
88
A cooling.
89
Around 50 million years ago, temperatures began dropping in a long-term cooling trend that lasted until the dawn of civilization.
90
The once lush forests at the poles are now becoming ice caps.
91
This was bad news for the Titanoboa.
92
The cooler climate didn't suit this cold-blooded snake.
93
It could no longer get the heat it needed from the environment to be able to power itself.
94
It's possible that this led to the Titanoboa's extinction about 55 million years ago.
95
In order to survive, it would have had to evolve in a different and totally unexpected way.
96
In our hypothetical scenario, the Titanoboa becomes warm-blooded.
97
Maybe you're thinking, well, can a cold-blooded animal really become warm-blooded?
98
How is that even possible?
99
Well, it's true that if we look at snakes, we don't see any examples of them being warm-blooded,
100
there is another category of cold-blooded creatures that have some warm-blooded exceptions.
101
Fish.
102
While the majority of fish are cold-blooded, about 0.1% are partially or fully warm-blooded.
103
For instance, the moonfish is warm-blooded.
104
Bluefin tuna, white sharks, and salmon sharks are kind of both.
105
They use a special mechanism to raise their body temperature called vascular countercurrent heat exchange.
106
Let me show you how it works.
107
Let's use a shark as an example.
108
The muscles they use to swim generate heat, which heats blood in the veins.
109
The arteries bring cold oxygenated blood from the gills to the shark's muscles and organs.
110
This cold blood picks up the heat from blood in the veins, which then raises the shark's internal temperature.
111
But in the Titanoboas case, there are no gills involved.
112
It breathes in through its nostrils and has lungs to supply it with oxygen.
113
But we can make it warm-blooded like the shark by having cold blood pumped in through the arteries
114
which then pick up the heat from the warm blood in the veins.
115
This single evolutionary transformation would allow the Titanoboa to survive the mass cooling.
116
Let's see what happens next.
117
Miocene.
118
23 million years ago to 5 million years ago.
119
During the Miocene epoch that followed, Earth began to warm a little, followed again by a period of cooling.
120
The climate became drier, and vegetation was more coarse.
121
Rhinos were dominant in North America.
122
Many species of horses evolved, as did a variety of camels.
123
Also a saber-toothed cat-like creature called the Nimravid roamed around.
124
Could the Titanoboa have adapted in new and different ways to spawn a line of desert titanoboas?
125
Yeah, I know I said that living on land would be tough for such a massive creature, but maybe there's an evolutionary path to make this possible.
126
To camouflage in the desert, it would need to adapt a new color scheme, a light sandy color.
127
And its next most important adaptation?
128
Strong muscles to burrow into desert soil and live underground during the day, both to to conserve energy and to hunt under the cover of darkness.
129
To protect against water loss through the skin, the Titanoboa would take a lesson from the Spadefoot Toad.
130
This toad secretes a semi-permeable membrane that makes its skin thick, locking in moisture.
131
Our desert Titanoboa would branch out and have a new diet of birds and mammals.
132
Many desert animals are too small to make a meal, so Titanoboa would lie in wait for a herd of camels, slither out of its burrow and make a killing.
133
Or it might go months without food.
134
So the evolutionary path of Titanoboas could lead to two subspecies.
135
The first one is shark-like, swimming far and wide across the ocean, able to preserve its body heat through adaptations that make it warm-blooded.
136
The second is also warm-blooded, but lives in burrows deep in the desert, like the sandworms from Dune.
137
They emerge from the burrows with lightning speed, only to strike, eat, and then retreat back underground.
138
These 21st century titanoboas would be as long as 23 meters and about 1.2 meters wide.
139
Imagine going for a swim in the ocean and running into one of those.
140
You'd have just enough time for one last breath.
141
6,000 years ago to today.
142
This brings us to the question of how modern-day humans might interact with these magnificent and terrifying creatures.
143
Before the start of modern hunting, Titanoboas would have been legendary, frightening sea creatures that terrified humans.
144
Our ancestors would probably be scared of going in the ocean. Who knows?
145
Any swim could be your last if you encountered a Titanoboa.
146
The only good news would have been that these enormous creatures would probably have little interest in eating you.
147
Because humans would provide little sustenance, they'd rather catch a large fish or crocodile.
148
That would be much more satisfying.
149
Now, as humans developed better weapons, the relationship would have changed.
150
There's evidence of humans hunting whales as far back as 6000 BCE.
151
If the Titanoboa was still around, it may have been a target of fishermen thousands of years ago.
152
Maybe these snakes would become part of our diet.
153
If their meat was tasty, who knows?
154
Maybe humans would have hunted them to near extinction by now.
155
In today's world, it'd be a lot like the occasional shark attack.
156
We'd probably hear about rare titanoboa attacks on humans who swam too far out into the ocean.
157
In the desert, nomadic tribes would probably fear the random, unpredictable attacks of the desert titanoboa.
158
Camels would have evolved to be super sensitive to those giant snakes underground movements.
159
Maybe they'd warn humans when they sensed activity underground.
160
With infrared technology, we'd be able to detect the heat signature of titanoboas in their underground burrows.
161
Future.
162
But in today's fast-changing world, something new and interesting would be happening.
163
Human activity has reversed the cooling trend.
164
With global warming, temperatures are becoming attractive for reptiles again.
165
Our newly evolved titanoboas have a warm-blooded inner architecture that has helped them survive the cooling of prior epochs, but as the Earth heats again,
166
the titanoboa would once again lean on the environment for heat rather than using its muscular interactivity.
167
Conditions would be ripe for the titanoboa to hunt even more effectively and grow bigger.
168
As sea levels rise in future years, our coastal cities will be flooded and destroyed.
169
The warm weather will help new generations of Titanoboa thrive.
170
But the traditional habitats of the Titanoboa are currently being destroyed.
171
The lush tropical swamplands and forests near tropical waters are being wiped out by logging and commercial activity.
172
The growing acidification of the waters will kill the marine life that the Titanoboa feeds on.
173
This would prove to be the biggest challenge for the creature, the destruction of its food supply.
174
But there is one prey left for the Titanoboa.
175
They would have to eat several to make a meal of them, but there's lots around.
176
You guessed it, I'm talking about us.
177
Maybe we'd become the target of the new ferocious Titanoboa.
178
Watch out the next time a coastal city floods.
179
Or maybe you should watch out for another giant creature, the Megalodon.
180
Those aren't still around, are they?
181
Oh, that sounds like a story for another What If.

Descargar app

Todo lo que necesitas para hablar con fluidez

Pronunciación con IAEvalúa cada oración
Práctica de IPADomina cada sonido
VocabularioConstruye tu banco de palabras
Juego de vocabularioAprende mientras juegas
Escanea el QR
Escanea el QR
Download on theApp StoreGet it onGoogle Play

Mismo canal

What If a Needle Hit The Earth At The Speed Of Light?B2
1

What If a Needle Hit The Earth At The Speed Of Light?

Daily ConversationUniversity StudentsWorking Adults
Earth Becomes a Moon | What If Saturn Took Over?B2
1

Earth Becomes a Moon | What If Saturn Took Over?

Daily ConversationWorking Adults
What If Megalodon Fought a 13-Meter Titanoboa in the Swamp?B2
2

What If Megalodon Fought a 13-Meter Titanoboa in the Swamp?

TeensDaily ConversationWorking Adults
8 Ancient Animals Scarier Than DinosaursB2
2

8 Ancient Animals Scarier Than Dinosaurs

Daily ConversationWorking Adults
You Are Alive to Watch the Space Station Fall From the SkyB2
2

You Are Alive to Watch the Space Station Fall From the Sky

Daily ConversationUniversity StudentsWorking Adults
What If a Megalodon Shark Fought the Kraken?B2
3

What If a Megalodon Shark Fought the Kraken?

Daily ConversationWorking Adults
What If Gravity Got 1% Stronger Every Second?B2
1

What If Gravity Got 1% Stronger Every Second?

Daily ConversationWorking Adults
What If the Kraken Was Real?B2
3

What If the Kraken Was Real?

Daily ConversationWorking Adults
What If you Could See the 4th Dimension?B2
3

What If you Could See the 4th Dimension?

Daily ConversationUniversity StudentsWorking Adults
What If Russia Started World War 3?B2
7

What If Russia Started World War 3?

Daily ConversationWorking Adults
What If You Were Swallowed ALIVE by a 60-Foot Sperm Whale?B2
2

What If You Were Swallowed ALIVE by a 60-Foot Sperm Whale?

Daily ConversationWorking Adults
What If | Channel Trailer | An Epic Exploration Of PossibilitiesB1
3

What If | Channel Trailer | An Epic Exploration Of Possibilities

University StudentsWorking Adults
What If the Megalodon Shark Fought the Leviathan Whale?B2
4

What If the Megalodon Shark Fought the Leviathan Whale?

University Students
What If the Megalodon Shark Fought the Mosasaurus?B1
7

What If the Megalodon Shark Fought the Mosasaurus?

University Students
What If the Mosasaurus Never Went Extinct?B2
3

What If the Mosasaurus Never Went Extinct?

University Students
What If The Megalodon Never Stopped Evolving?B2
4

What If The Megalodon Never Stopped Evolving?

University Students
What Happened After the DEADLIEST Asteroid Hit Earth?B2
1

What Happened After the DEADLIEST Asteroid Hit Earth?

Daily ConversationUniversity StudentsWorking Adults
What If We Had To Rebuild Human Society From Scratch?B2
3

What If We Had To Rebuild Human Society From Scratch?

Daily ConversationUniversity StudentsWorking Adults
What If We Built Vertical Farms?B2
6

What If We Built Vertical Farms?

IELTS PrepTOEFL PrepUniversity Students
What If You Lived on Mars 1 Billion Years Ago?B2
3

What If You Lived on Mars 1 Billion Years Ago?

Daily ConversationUniversity StudentsWorking Adults
FOR YOU

Recomendar Video

What If Dinosaurs Never Stopped Evolving for 66 Million Years?B2
3
89 oraciones

What If Dinosaurs Never Stopped Evolving for 66 Million Years?

Daily ConversationUniversity Students
Why The Entire Ocean Is Terrified of Sperm WhalesB2
1
172 oraciones

Why The Entire Ocean Is Terrified of Sperm Whales

Daily ConversationUniversity StudentsWorking Adults
Fossils of a Giant Superpredator Found in AntarcticaB2
2
112 oraciones

Fossils of a Giant Superpredator Found in Antarctica

Daily ConversationUniversity StudentsWorking Adults
The Most Dangerous AnimalB2
13
13 oraciones

The Most Dangerous Animal

Daily ConversationUniversity StudentsWorking Adults
Before We Became the Last Humans:The Lost Species That Once Shared Our World|Prehistoric DocumentaryC1
1
402 oraciones

Before We Became the Last Humans:The Lost Species That Once Shared Our World|Prehistoric Documentary

Daily ConversationUniversity StudentsWorking Adults
5 "Impossible" Things That Can Happen On Other PlanetsB2
3
66 oraciones

5 "Impossible" Things That Can Happen On Other Planets

Daily ConversationUniversity StudentsWorking Adults
What If Jurassic Park Was Real? THEY ESCAPEDB2
3
159 oraciones

What If Jurassic Park Was Real? THEY ESCAPED

Daily ConversationUniversity StudentsWorking Adults
Could Humans Evolve Flight?C1
117
15 oraciones

Could Humans Evolve Flight?

Daily ConversationUniversity StudentsWorking Adults
How to Survive a Godzilla AttackB2
3
53 oraciones

How to Survive a Godzilla Attack

Daily ConversationHigh School StudentsUniversity Students
READING EXPLORER 1 UNIT 7B MYSTERY OF THE TERRIBLE HANDB2
6
26 oraciones

READING EXPLORER 1 UNIT 7B MYSTERY OF THE TERRIBLE HAND

Daily ConversationUniversity Students
The Insane Biology of: The OctopusC1
4
204 oraciones

The Insane Biology of: The Octopus

Daily ConversationUniversity StudentsWorking Adults

Vocabulario y notas de pronunciación para esta lección

Esta lección de conversación de nivel B2 se basa en el vídeo “What If the Titanoboa Never Stopped Evolving for 55 Million Years?”. Las palabras que más se repiten: titanoboa, heat, warm, blooded, creature. Este vídeo tiene 181 frases y 2237 palabras para practicar shadowing. La parte hablada dura 15:15. El hablante mantiene un ritmo constante de unas 147 palabras por minuto, cómodo para el shadowing. Solo el 77 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.

Vocabulario clave de este vídeo

Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:

PalabraPronunciaciónSignificado
spike sustantivo/spaɪk/clavo, pincho
extinct adjetivo/ɪkˈstɪŋkt/extinto
evolve verbo/ɪˈvɑlv/desarrollar
burrow sustantivo/ˈbʌɹoʊ/madriguera, ratonera
tropical adjetivo/ˈtɹɑ.pɪ.kəl/tropical
crocodile sustantivo/ˈkɹɑkədaɪl/cocodrilo, crocodilo
camel sustantivo/ˈkæm(ə)l/camello, dromedario
thrive verbo/θɹajv/prosperar, crecer
extinction sustantivo/ɪkˈstɪŋkʃən/extinción
evolutionary adjetivo/ˌiː.vəˈluː.ʃən.ɛɹ.i/evolutivo, evolucionista
acidic adjetivo/əˈsɪd.ɪk/ácido
predator sustantivo/ˈpɹɛd.ə.tɚ/predador, depredador
vein sustantivo/veɪn/vena
adapt verbo/əˈdæpt/adaptar, ajustar
adaptation sustantivo/ˌæd.æpˈteɪ.ʃən/adaptación

Phrasal verbs que vas a escuchar

PalabraPronunciaciónSignificado
pick up verbocoger, asir
cool down verbo/kuːl ˈdaʊn/enfriarse
die out verboextinguirse
figure out verboaveriguar, captar
get through verbo/ɡɛt ˈθɹu/aguantar, salir adelante
watch outcuidado, ojo
wipe out verboaniquilar, exterminar

Frases que vale la pena repetir

Frases cortas y completas del vídeo que puedes reutilizar en la conversación diaria:

  • Let's use a shark as an example.
  • Let's see what happens next.
  • You'd have just enough time for one last breath.
  • You guessed it, I'm talking about us.
  • Those aren't still around, are they?

Gramática en este vídeo

Las estructuras que más usa el hablante, con las palabras exactas del vídeo:

EstructuraEn el vídeo
Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hacebe met · was left · were covered
Present perfect have/has + participio pasado — una acción pasada que sigue importando ahorahave warmed · have adapted · has reversed

Pronunciación a tener en cuenta

El hablante usa 18 contracciones y formas reducidas, como we'd, aren't, don't. Dilas en su forma corta, tal como las oyes.

  • Los sonidos de “th”: thrive /θɹajv/, bathtub /ˈbæθtʌb/, hypothetical /ˌhaɪpəˈθɛtɪkəl/
  • Los sonidos de “sh” y “zh”: extinction /ɪkˈstɪŋkʃən/, evolutionary /ˌiː.vəˈluː.ʃən.ɛɹ.i/, adaptation /ˌæd.æpˈteɪ.ʃən/, camouflage /ˈkæ.məˌflɑːʒ/, acidification /əˌsɪdɪfɪˈkeɪʃən/
  • Palabras largas — cuida el acento: evolutionary /ˌiː.vəˈluː.ʃən.ɛɹ.i/, adaptation /ˌæd.æpˈteɪ.ʃən/, acidification /əˌsɪdɪfɪˈkeɪʃən/, alligator /ˈæl.ɪ.ɡeɪ.tɚ/, hypothetical /ˌhaɪpəˈθɛtɪkəl/

Sonidos difíciles para hispanohablantes:

  • s + consonante al inicio — sin añadir una “e” delante: spike /spaɪk/, squeeze /skwiːz/
  • /v/ — no es /b/: los dientes tocan el labio inferior: evolve /ɪˈvɑlv/, thrive /θɹajv/, evolutionary /ˌiː.vəˈluː.ʃən.ɛɹ.i/, vein /veɪn/, conserve /kənˈsɜː(ɹ)v/
  • /z/ — sonora, no /s/: squeeze /skwiːz/, metabolism /məˈtæb.əˌlɪz.əm/, unpleasant /ʌnˈplɛzn̩t/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, preserve /pɹəˈzɝv/

Cómo practicar con este vídeo

  1. Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
  2. Haz shadowing frase por frase a velocidad normal, repitiendo cada una hasta que tu ritmo coincida con el del hablante.
  3. Grábate y compara con el original, prestando atención a palabras como spike, extinct, evolve.

¿Qué es la Técnica de Shadowing?

Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.

Técnica de shadowing: lee la guía completa paso a paso →