Shadowing Practice: Why Don't Snakes Poison Themselves? - Learn English Speaking with Video
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The Egyptian cobra's venom is super toxic.
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Even in tiny quantities, it can kill relatively big animals.
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But the Egyptian cobra, as well as pretty much every other toxic animal,
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has to produce and store those deadly chemicals inside its own body.
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So why don't toxic animals hurt themselves?
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Hi, I'm Cameron, and this is MinuteEarth.
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The first, and probably most obvious,
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way to avoid kicking your own bucket is to make sure your poison doesn't work on you,
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which is a strategy many poison dart frogs use use.
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When their poison gets on another critter,
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it snaps into specially shaped receptors in that animal's nerves,
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eventually stopping its heart.
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But the poison doesn't affect the frog itself,
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because the frog has evolved a slightly different version of that nerve protein,
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changing its shape just enough to prevent the poison from ever latching on.
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Another option is to have a way to soak up your own poison before it can kill you,
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like the pitohui, a tropical bird that puts poison in its feathers.
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In order to keep itself safe from its own poison,
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it produces proteins in its bloodstream that act like sponges that stick to,
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and basically disarm, poison molecules.
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The next strategy is even simpler.
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Simply store your toxins in a place where they can't hurt you,
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like murder hornets and black widow spiders do.
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Both of these animals are susceptible to their own venom,
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but their weaponry is located in a place where it is walled off from the rest of the body,
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and for them, it's physically impossible to unleash it on themselves.
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And finally, you could store your toxins in an inactive form,
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like the slow loris, the world's only venomous primate, does.
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The toxin the loris secretes from its armpits is completely harmless on its own.
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It's only when the animal licks its armpit,
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putting the venom in contact with saliva,
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that the venom becomes activated.
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And when the loris subsequently bites an enemy,
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that venom gets transferred to the bite wound,
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where it causes the victim's flesh to rot away.
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Because carrying deadly chemical weapons inside your own body is such a high-stakes situation,
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lots of toxic species actually use more than one of these strategies to stay safe.
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Which brings us back to the Egyptian Cobra,
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which uses all four methods to protect itself from its own venom.
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The snake has those modified nerve proteins that make it immune to the nerve paralyzing toxin in its venom.
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But since that venom is a cocktail that contains other toxins to,
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the snake also stores it in walled-off glands.
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Beyond just locking the venom away,
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these glands also temporarily inactivate the venom in part by bathing it in acids.
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It only becomes reactivated in a basic environment, like its victim's blood.
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And if the venom happens to leak into the snake's own blood,
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a sponge-like protein in its bloodstream mops up the toxins before they do any harm.
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In other words, if you're going to be venomous or poisonous, Use protection.
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If you're a snake and you want to level up your game,
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Thanks, Boo.dev!
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Thank you.
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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 Snakes Poison Themselves?”. Las palabras que más se repiten: venom, poison, toxin, animal, nerve. Este vídeo tiene 67 frases y 679 palabras para practicar shadowing. La parte hablada dura 3:39. El hablante habla rápido, unas 186 palabras por minuto, así que espera sonidos enlazados y reducidos. Solo el 76 % 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 |
|---|---|---|
| venom sustantivo | /ˈvɛnəm/ | veneno, tósigo |
| poison sustantivo | /ˈpɔɪ.zən/ | veneno, ponzoña |
| toxin sustantivo | /ˈtɑksɪn/ | toxina |
| bloodstream sustantivo | /ˈblʌd.stɹɪim/ | torrente sanguíneo |
| gland sustantivo | /ɡlænd/ | glándula |
| venomous adjetivo | /ˈvɛnəməs/ | venenoso |
| cobra sustantivo | /ˈkoʊbɹə/ | cobra |
| sponge sustantivo | /spʌnd͡ʒ/ | esponja |
| specially adverbio | /ˈspɛʃəli/ | especialmente, específicamente |
| critter sustantivo | /ˈkɹɪtɚ/ | bichito, críter |
| disarm verbo | /dɪsˈɑɹm/ | desarmar |
| gamify verbo | ludificar, gamificar | |
| hornet sustantivo | /ˈhɔɹ.nɪt/ | avispón |
| paralyze verbo | /ˈpæɹəˌlaɪz/ | paralizar |
| primate sustantivo | /ˈpɹaɪmeɪt/ | primate |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| get off verbo | bajarse |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | has evolved · has created · They've gamified |
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is located · are designed |
Pronunciación a tener en cuenta
El hablante usa 10 contracciones y formas reducidas, como you're, doesn't, can't. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: specially /ˈspɛʃəli/, unleash /ʌnˈliʃ/
- Palabras largas — cuida el acento: inactivate /ɪˈnæktɪveɪt/, temporarily /ˌtɛmpəˈɹɛɹəli/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: sponge /spʌnd͡ʒ/, specially /ˈspɛʃəli/, sponsor /ˈspɒn.səː/
- /v/ — no es /b/: los dientes tocan el labio inferior: venom /ˈvɛnəm/, venomous /ˈvɛnəməs/, inactivate /ɪˈnæktɪveɪt/, saliva /səˈlaɪvə/, motivate /ˈmoʊ.tɪ.veɪt/
- /z/ — sonora, no /s/: poison /ˈpɔɪ.zən/, paralyze /ˈpæɹəˌlaɪz/, poisonous /ˈpɔɪzənəs/
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 venom, poison, toxin.
¿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.