Section4:Bird Migration Theory 纠错
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Part A :

Question 31 - 40

Complete the notes below.

Write ONE WORD ONLY for each answer.

Write NO MORE THAN THREE WORDS AND/OR A NUMBER for each answer.

Bird Migration Theory

Most birds are believed to migrate seasonally.


Hibernation theory

●   It was believed that birds hibernated underwater or buried themselves in  .

●   This theory was later disproved by experiments on caged birds.


Transmutation theory

●   Aristotle believed birds changed from one species into another in summer and winter.

        –  In autumn he observed that redstarts experience the loss of  and thought they then turned into robins.

        –  Aristotle's assumptions were logical because the two species of birds had a similar  .


17th century

●   Charles Morton popularised the idea that birds fly to the  in winter.

Scientific developments

●   In 1822, a stork was killed in Germany which had an African spear in its  .

        –  previously there had been no  that storks migrate to Africa


●   Little was known about the  and journeys of migrating birds until the practice of ringing was established.

        –  It was thought large birds carried small birds on some journeys because they were considered incapable of travelling across huge  .

        –  Ringing depended on what is called the  ' ' of dead birds.

●   In 1931, the first  to show the migration of European birds was printed.


显示答案 正确答案:

31. mud   

32. feathers   

32. shape   

34. moon   

34. neck   

36. evidence   

37. destinations   

38. oceans   

39. recovery   

40. atlas   

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