Shadowing Practice: Why Don't Blue Whales Eat Fish? - Learn English Speaking with Video
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The most massive land animals in the world all eat little stuff, grass and leaves.
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And almost all of the most massive aquatic animals also eat something itty-bitty,
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tiny crustaceans called krill.
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Why do such big things eat such small things?
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Hi, I'm David, and this is MinuteEarth.
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The most ginormous animals all need to eat a huge amount of calories to fuel their massive bodies.
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But there aren't enough big,
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super calorie-dense meals around for them to eat.
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And even if there were,
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the giant's massive bodies aren't mobile or agile enough to actually capture that food.
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Instead, these mega-creatures meet their mega-calorie quota with something that's super-abundant
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and requires almost no effort to procure — little pieces of grass and leaves.
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And for our purposes, we're going to consider leaves to be little,
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even if they do come off of bigger things.
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And sure, leaves and grass aren't very calorie-dense compared to things other animals eat,
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but the giant's giant digestive tracts can hold a lot of them at once — we're talking hundreds of kilograms.
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Plus, the bigger an animal is,
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the longer the food stays in its digestive system,
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and the more microbes there are in there to break it down.
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All of that means that the giants are able to wring a lot of calories from grass and leaves,
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enough to meet their huge calorie demands.
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The abundance and ease of finding leaves and grass,
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and the specialized digestive systems to deal with large quantities of them,
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are why, at least on land,
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you see the same pattern in every biome.
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The very biggest animals are herbivores.
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Even back in the day when dinosaurs roamed the earth,
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the biggest animals weren't predators like T-Rexes,
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they were lumbering, leap-eating vegetarians.
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But what about the ocean?
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Like their counterparts on land,
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sea giants like blue whales are relatively unagile and have giant guts,
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so it makes sense that they'd eat the ocean equivalent of grass,
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huge blooms of tiny plant-like microorganisms called bitoplankton.
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But these ocean behemoths need so many calories every day that phytoplants,
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even lots and lots and lots of them,
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just aren't calorie dense enough to meet the demand.
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Luckily, those big phytoplankton blooms attract something else,
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billions of calorie packed krill that come together to graze in huge,
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slow moving, easy to find swarms.
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A blue whale that lunges back
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and forth through a swarm can easily take in more than enough calories to power its huge body.
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The equivalent on land would be if there were huge,
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slow moving swarms of grasshoppers that elephants could munch on instead of the grass itself.
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In that case, the pachyderms could pack in even more calories and likely get even bigger.
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Either way though, the same truth holds.
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For the biggest animals on earth,
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it turns out, food things come in small packages.
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “Why Don't Blue Whales Eat Fish?”. Las palabras que más se repiten: calorie, animal, grass, eat, leaves. Este vídeo tiene 48 frases y 485 palabras para practicar shadowing. La parte hablada dura 2:18. El hablante habla rápido, unas 211 palabras por minuto, así que espera sonidos enlazados y reducidos. Solo el 79 % 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:
| Palabra | Pronunciación | Significado |
|---|---|---|
| calorie sustantivo | /ˈkæləɹi/ | caloría |
| digestive adjetivo | /daɪˈdʒɛstɪv/ | digestivo |
| swarm sustantivo | /swɔɹm/ | enjambre, nube |
| dense adjetivo | /ˈdɛns/ | denso |
| krill sustantivo | /kɹɪl/ | kril |
| whale sustantivo | /ˈweɪl/ | ballena |
| behemoth sustantivo | /bəˈhi(ː).məθ/ | behemot |
| crustacean sustantivo | /kɹʌsˈteɪʃən/ | crustáceo |
| ginormous adjetivo | /dʒaɪˈnɔɹməs/ | descomunal, gigantesco |
| grasshopper sustantivo | /ˈɡɹæsˌhɑpəɹ/ | saltamontes, langosta |
| herbivore sustantivo | /ˈ(h)ɜːɹbɪvɔːɹ/ | herbívoro |
| kilogram sustantivo | /ˈkɪləɡɹæm/ | kilogramo, quilogramo |
| microbe sustantivo | /ˈmaɪkɹoʊb/ | microbio |
| microorganism sustantivo | /ˌmaɪ.kɹoʊˈɔɹ.ɡəˌnɪz.m̩/ | microorganismo |
| pachyderm sustantivo | /ˈpæk.ɪˌdɜː(ɹ)m/ | paquidermo |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| turn out verbo | resultar |
Pronunciación a tener en cuenta
El hablante usa 9 contracciones y formas reducidas, como aren't, we're, I'm. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: crustacean /kɹʌsˈteɪʃən/, specialize /ˈspɛʃəˌlaɪz/
- Palabras largas — cuida el acento: microorganism /ˌmaɪ.kɹoʊˈɔɹ.ɡəˌnɪz.m̩/, phytoplankton /ˌfaɪ.təˈplæŋk.tən/, vegetarian /vɛ.d͡ʒɪˈtɛ.ɹi.ən/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: swarm /swɔɹm/, specialize /ˈspɛʃəˌlaɪz/
- /v/ — no es /b/: los dientes tocan el labio inferior: digestive /daɪˈdʒɛstɪv/, herbivore /ˈ(h)ɜːɹbɪvɔːɹ/, vegetarian /vɛ.d͡ʒɪˈtɛ.ɹi.ən/
- /z/ — sonora, no /s/: microorganism /ˌmaɪ.kɹoʊˈɔɹ.ɡəˌnɪz.m̩/, specialize /ˈspɛʃəˌlaɪz/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como calorie, digestive, swarm.
¿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.