Практика Shadowing: How Weaver Birds Evolved to Build Huge Nests - Изучайте разговорный английский по видео
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The rising sun marks the start of a new day, and in Africa's Kalahari Desert, the wildlife is already awake and busy.
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This masked weaver bird scans the area, carefully collecting blades of dry grass to build his nest.
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Most birds simply build what looks like a loose bowl of twigs, but this is a weaver bird,
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and like his namesake, he weaves his nests into intricate structures.
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These chambers hang from trees, an impressive feat of avian architecture.
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Their cousins, the sociable weaver birds, take nest building even further.
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Together, our colony will build a huge compound nest containing more than 100 chambers, each one housed under a single roof.
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It's a bird apartment complex, one of the world's largest nests, and it isn't just for breeding.
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Weavers live in them throughout the year, some nests lasting for even a century, as it passes from generation to generation.
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To craft his nest, the weaver bird loops to gather blades of grass around a tree branch.
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Having created the base, he then builds the hollow body before adding the entrance last.
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He'll need around a thousand blades to make a strong nest, and this may take him a few weeks to complete.
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Some species design domes, while others prefer tubed entrances.
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But nests of the sociable weaver birds aren't made in the same way.
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They don't so much weave them, rather they stack them with whatever plant material they can find.
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True weaver birds are only found in the subfamily Plessione.
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In the whole weaver family, there are over 100 species, most of which live in sub -Saharan Africa.
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The family originated in the mid -Miosyn around 15 million years ago.
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It was a time when African ecosystems made the shift from forests to grasslands,
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allowing early weavers to spread and radiate into the species seen today.
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Although some aren't true weavers, they can all build elaborate nests, and the journey of how this behaviour emerged may be simpler than expected.
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The Weaver family belongs to a group of birds known as passerines.
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Most passerines today build open nests, and it could easily be assumed that some birds then learn to enclose them.
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But this study found it was actually the other way around.
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Open nests evolved from closed nests in ancient passerines, even occurring independently at least three times.
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They're simple and easy to build, and they don't cost as much energy, and yet the weaver birds still kept their roofs.
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In the Kalahari, temperatures can climb to 110 degrees Fahrenheit during the day, and dip by 40 at night.
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Enclosed nests offer more protection from these weather extremes, preventing birds and their eggs from reaching deadly temperatures.
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They also free parents from the burden of incubation,
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as they no longer need to provide constant shade for the young themselves and suffer under the blazing sun.
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For weavers, they are stable homes.
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In fact, they may be so well adapted for extreme conditions that they could have restricted their dispersal,
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as weavers are mostly found in hot dry climates.
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Other Passerene birds expanded into a wide range of habitats, losing the domes and opting for a more freeing nest shape.
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In early weavers, solitary nesting may have then led to group nesting.
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This may be seen in the Plossa Passerini subfamily, where the sporopipes mostly breed alone while the other genera breed in colonies.
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It isn't uncommon for small birds to live in groups.
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They flock together, moving to wherever there's food or water.
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In groups, information can be easily exchanged between individuals, allowing birds to follow whoever's managed to find food.
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And this can be useful especially when food appears in abundant patches.
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Weaver birds mostly feed on insects, and since there's enough to go around, group living can be favoured.
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It can also reduce the risk of predation.
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Small birds tend to have many natural enemies, and so the larger the colony, the more eyes on the lookout,
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and the lower the chances of being targeted.
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In weavers, selection may have driven larger groups, but when there are too many in a single tree, it can get a little crowded.
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Physical contact between nests occurs, and eventually some nests are even built directly next to others, fused together into a single mass.
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Usually, birds and colonies are still territorial.
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They can get aggressive, defending their space by pecking and squawking at the intruder.
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But an enclosed nest helps to more easily define the boundaries of a territory, and allows birds to tolerate their neighbours, even in tight masses.
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This may have been an important precursor for the evolution of compound nesting.
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In grey -capped social weavers, birds may build both separate and compound nests, so they may represent an intermediate stage towards this behaviour.
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But sociable weavers differ in that they also build a communal roof over their nests.
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The roof requires colony members to work together to maintain.
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This behaviour was long thought to be driven by the extra security from predators, but predation rates are still high.
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In fact, on average, 70 % of clutches are often raided, especially from snakes.
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So perhaps this roof -building behaviour was driven by temperature control instead.
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Some studies have even suggested it's maintained by kin selection.
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Sociable weavers are very cooperative birds birds.
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Nearly all breeding pairs are assisted by helpers.
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Juveniles will also help feed their younger siblings and even neighbours.
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And because close neighbours tend to be relatives, building a communal roof may be driven by kin selection, since it benefits the extended family as well.
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Not all birds contribute to the job equally, but those that do are more closely related to colony members than those that don't.
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In weavers, parallel evolution of compound nesting has even occurred across the different subfamilies,
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and convergent evolution across different species highlights the significance of this behaviour in small birds.
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These nests are a work of animal architecture, capturing beautifully how nature strives for survival in the most magnificent of ways.
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Thank you.
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Лексика и советы по произношению к этому уроку
Этот урок разговорной практики построен на видео «How Weaver Birds Evolved to Build Huge Nests». Чаще всего повторяются слова: bird, weaver, nest, build, roof. В этом видео 66 предложений и 998 слов для шедоуинга. Речь длится 7:21. Говорящий держит ровный темп — около 136 слов в минуту, удобный для шедоуинга. Только 74% слов входят в 3000 самых частых слов английского языка, поэтому лексика сложная.
Ключевая лексика этого видео
15 слов из видео, которые стоит выучить, с произношением и значением:
| Слово | Произношение | Значение |
|---|---|---|
| nest существительное | /nɛst/ | гнездо́ |
| weaver существительное | /ˈwi.vɚ/ | ткач, ткачи́ха |
| compound существительное | /ˈkɑmpaʊnd/ | соедине́ние, сочета́ние |
| breed глагол | /ˈbɹiːd/ | плоди́ться, размножа́ться |
| occur глагол | /əˈkɜː/ | происходи́ть, произойти́ |
| evolution существительное | /ˌiːvəˈluːʃ(ə)n/ | эволю́ция, разви́тие |
| blade существительное | /bleɪd/ | ле́звие |
| neighbour существительное | /ˈneɪbɚ/ | сосе́д, сосе́дка |
| chamber существительное | /ˈt͡ʃeɪ̯mbɚ/ | ко́мната |
| architecture существительное | /ˈɑː.kɪˌtɛk.t͡ʃə/ | архитекту́ра, зо́дчество |
| entrance существительное | /ˈɛn.tɹəns/ | вхожде́ние, въезд |
| grass существительное | /ɡɹɑːs/ | трава́, мурава́ |
| dome существительное | /dəʊm/ | ку́пол, свод |
| communal прилагательное | /kəˈmjuː.nəl/ | общи́нный, коммуна́льный |
| weave глагол | /wiːv/ | ткать, сотка́ть |
Грамматика в этом видео
Конструкции, которые говорящий использует чаще всего, с точными словами из видео:
| Конструкция | В видео |
|---|---|
| Пассивный залог be + причастие прошедшего времени — важно, что происходит, а не кто это делает | aren't made · are only found · be assumed |
| Present Perfect have/has + причастие прошедшего времени — прошлое действие, важное сейчас | have even suggested · has even occurred |
Произношение, на которое стоит обратить внимание
Говорящий использует 9 сокращённых и редуцированных форм, например don't, aren't, isn't. Произносите их коротко, так, как слышите.
- Звуки «sh» и «zh»: evolution /ˌiːvəˈluːʃ(ə)n/, capture /ˈkæp.(t)ʃɚ/, shade /ʃeɪd/, sociable /ˈsoʊʃəbəl/, incubation /ɪnkjuːˈbeɪʃən/
- Длинные слова — следите за ударением: evolution /ˌiːvəˈluːʃ(ə)n/, architecture /ˈɑː.kɪˌtɛk.t͡ʃə/, significance /sɪɡˈnɪfɪkəns/, elaborate /ɪˈlæb.ə.ɹeɪt/, independently /ˌɪndɪˈpɛndəntli/
Звуки, трудные для русскоязычных:
- /w/ — губы округлены, это не /v/: weaver /ˈwi.vɚ/, weave /wiːv/, equally /ˈiːkwəli/, wildlife /ˈwaɪldlaɪf/, wherever /(h)wɛɹˈɛvɚ/
- /h/ — лёгкий выдох, а не русское «х»: wherever /(h)wɛɹˈɛvɚ/, highlight /ˈhaɪˌlaɪt/, habitat /ˈhæb.ɪ.tæt/, hollow /ˈhɑloʊ/, helper /ˈhɛlpɚ/
- Звонкие согласные в конце слова — не оглушайте их: compound /ˈkɑmpaʊnd/, breed /ˈbɹiːd/, blade /bleɪd/, weave /wiːv/, relative /ˈɹɛl.ə.tɪv/
Как заниматься с этим видео
- Прослушайте всё видео один раз молча и выпишите незнакомые слова.
- Повторяйте предложение за предложением на обычной скорости, пока ваш ритм не совпадёт с ритмом говорящего.
- Запишите себя и сравните с оригиналом, обращая внимание на такие слова, как nest, weaver, compound.
Что такое техника Shadowing?
Shadowing — это научно обоснованная техника изучения языка, изначально разработанная для подготовки профессиональных переводчиков и популяризированная полиглотом доктором Александром Аргуэльесом. Метод прост, но эффективен: вы слушаете аудио на английском от носителей языка и немедленно повторяете вслух — как тень, следующая за говорящим с задержкой в 1–2 секунды. В отличие от пассивного прослушивания или грамматических упражнений, Shadowing заставляет мозг и мышцы рта одновременно обрабатывать и воспроизводить реальные речевые паттерны. Исследования показывают, что это значительно улучшает точность произношения, интонацию, ритм, связную речь, понимание на слух и беглость речи — что делает его одним из самых эффективных методов для подготовки к IELTS Speaking и реального общения на английском.