シャドーイング練習: How do snakes swallow animals so much bigger than they are? - Niko Zlotnik - YouTubeで英語スピーキングを学ぶ
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How can a bigger tube fit inside a smaller tube?
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How can a bigger tube fit inside a smaller tube?
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This might sound like a riddle,
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but it's a practical dilemma in our snake-eat-snake world.
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This eastern kingsnake, for example,
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has a mouthful of a Texas rat snake,
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but the rat snakes longer than it is.
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So how can the kingsnake possibly swallow it whole?
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This is just one of countless predatory dilemmas snakes have solved.
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Since slithering onto the scene some 150 million years ago,
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evolving length and limblessness out of their ancestral lizard forms,
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snakes have diversified rapidly.
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Their noodley bodies and flexible heads granted them access to novel places and prey.
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And today there are nearly 4,000 snake species,
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spanning habitats high and low, wet and dry.
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All are carnivorous, but their diets range from fish eggs to alligators.
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Jaw-dropping anatomy allows most snakes to swallow their meals whole.
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Because their jaw bones aren't fused like ours,
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but connected by an elastic ligament,
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and the bones on the sides of their lower jaws flare apart,
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they can dramatically stretch their maws.
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Reticulated pythons can even achieve 180 degree gapes.
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Sharp, curved teeth also line many snakes' jaws,
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keeping prey from wriggling out.
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And to prevent suffocation when choking down a big meal,
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many snakes shift the position of their airways entrance and isolate which ribcage regions they inhale with.
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Pythons are also equipped with stretchy tissue along their jaws,
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enabling them to spread four times wider than their own skulls.
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They've been documented using this skill to eat hyenas,
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alligators, and yes, even humans, whole.
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Their skin might sag after all the stretching,
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and it could take weeks to metabolize meals this large,
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but it seems their intestines have special cells for helping digest bones,
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and they can sometimes survive for over a year on just one feast.
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African egg-eating snakes, meanwhile, consume large,
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intact bird eggs, piercing their shells in their esophagi using inward-facing vertebral spines.
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While many snakes make a show of swallowing things whole,
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crab-eating snakes often pry their prey's limbs off one by one.
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And blind snakes decapitate their termite targets,
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probably to prioritize their more digestible bodies.
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Some blind snakes actually use chemical secretions to repel their prey because it allows them to hang out in ant colonies,
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snacking on their inhabitants without being attacked.
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Their skills have even been noticed by other species.
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Eastern screech owls sometimes place blind snakes in their nests where they eat the insects that might otherwise harm their young.
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In fact, baby owls with a blind snake nest mate have higher rates of growth and survival.
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The same can't be said for other species.
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Turtle-headed sea snakes scrape fish eggs off coral reefs.
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And cat-eyed snakes hunt red-eyed tree frog eggs.
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However, even as embryos, the developing frogs can sense an attacking snake's vibrations and may prematurely hatch to escape.
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It's a sacrifice, but at least it's not certain death by serpent.
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Garter snakes, meanwhile, go after western newts,
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even though their skin is packed with a potent neurotoxin.
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Just one bite could kill a person.
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But garter snakes swallow the newts unscathed,
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since modified proteins in their nerve cells prevent the toxin from binding.
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Not only that, but since the toxin may remain in their livers for weeks afterwards,
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it may even end up lending garter snakes protection against their predators.
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However, snakes more often make their own toxins,
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injecting or spitting venom from specialized glands out of grooved or syringe-like fangs.
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Philippine cobra venom is full of fast-acting neurotoxins that cause paralysis and respiratory failure.
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West African sore-scaled viper venom is a cocktail of compounds that cause profuse bleeding and tissue death.
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And while inland taipans are thought to possess the world's most potent venom,
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they tend to reserve it for quickly killing rodents.
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But we still haven't answered how smaller snakes can consume bigger ones.
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It turns out that the kingsnake does this with an elegant trick.
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Once it runs out of space in its flexible stomach,
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it stretches and compresses its spine,
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shoving the ratsnake into a kinked,
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zigzag shape within its digestive tract.
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So, a post-meal x-ray may look like this this.
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Sorry, we know the truth can be hard to swallow.
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Unless, of course, you're a snake.
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Ready to keep learning?
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Watch these videos to either challenge what you think you know,
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or learn more about what you don't.
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Subscribe and stay curious!
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このビデオで話す練習をする理由は？
このビデオは、蛇がどのように自分よりも大きな獲物を丸呑みするのかを解説しています。生き物の食性や生態について話すことにより、自然や動物に関する英語のボキャブラリーを増やすことができます。特に、自然科学の話題はIELTS スピーキング対策としても非常に有益です。このビデオを通じて、英語での効果的かつ流暢なコミュニケーション能力を養うことができるでしょう。
文法と表現の文脈
このビデオで使用されているいくつかの重要な文法構造や表現を見てみましょう。
- 過去形と受動態: 蛇の進化についての説明では、過去の出来事を述べるために過去形や受動態が多く使われています。例えば、「進化しました」や「見つけられた」といったフレーズです。
- 比較構造: 大きさの比較や解剖学に関連する表現には、「より大きな」や「～のように」という比較構造が多く登場します。これにより言い回しが豊かになります。
- 因果関係の表現: 「〜だから」や「その結果」といった表現を使用することで、特定の現象や事象の理由を述べています。
共通の発音のトラップ
ビデオには、いくつかの発音が難しい単語やアクセントがあります。例えば、「プロテイン」や「ギャップ」などの言葉は、正しく発音することが難しいかもしれません。また、自然科学用語のアクセントにも注意が必要です。英語の発音を良くするためには、こうした単語を繰り返し練習することが大切です。さらに、shadow speech技法を使って、ビデオに合わせて声を出すことで、より正確な発音を習得できます。
このビデオを通じて、shadowing siteでの実践を行い、英語シャドーイングの練習ができます。蛇の生態について学びながら、興味深い内容でリスニング力とスピーキング力を同時に向上させましょう。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。