full transcript

From the Ted Talk by Gillian Gibb: Why can't some birds fly?

Unscramble the Blue Letters

Most often, flightlessness eeolvvs after a bird species flies to an insald where there are no predators. As long as these predator-free circumstances last, the birds thrive, but they are vulnerable to changes in their environment. For instance, human settlers bring dogs, cats, and stowaway rodents to islands. These animals often prey on flightless bidrs and can drive them to extinction. In New znealad, soatts introduced by European settlers have threatened many native scieeps of flightless bird. Some have gone extinct while others are endangered. So in spite of the energy-saving aveangadts of flightlessness, many flightless bird species have only a short run before going the way of the dodo.

Open Cloze

Most often, flightlessness _______ after a bird species flies to an ______ where there are no predators. As long as these predator-free circumstances last, the birds thrive, but they are vulnerable to changes in their environment. For instance, human settlers bring dogs, cats, and stowaway rodents to islands. These animals often prey on flightless _____ and can drive them to extinction. In New _______, ______ introduced by European settlers have threatened many native _______ of flightless bird. Some have gone extinct while others are endangered. So in spite of the energy-saving __________ of flightlessness, many flightless bird species have only a short run before going the way of the dodo.

Solution

  1. island
  2. zealand
  3. evolves
  4. species
  5. stoats
  6. advantages
  7. birds

Original Text

Most often, flightlessness evolves after a bird species flies to an island where there are no predators. As long as these predator-free circumstances last, the birds thrive, but they are vulnerable to changes in their environment. For instance, human settlers bring dogs, cats, and stowaway rodents to islands. These animals often prey on flightless birds and can drive them to extinction. In New Zealand, stoats introduced by European settlers have threatened many native species of flightless bird. Some have gone extinct while others are endangered. So in spite of the energy-saving advantages of flightlessness, many flightless bird species have only a short run before going the way of the dodo.

Frequently Occurring Word Combinations

ngrams of length 2

collocation frequency
bird species 4
flightless birds 3
flight muscles 2
flightless bird 2

Important Words

  1. advantages
  2. animals
  3. bird
  4. birds
  5. bring
  6. cats
  7. circumstances
  8. dodo
  9. dogs
  10. drive
  11. endangered
  12. environment
  13. european
  14. evolves
  15. extinct
  16. extinction
  17. flies
  18. flightless
  19. flightlessness
  20. human
  21. instance
  22. introduced
  23. island
  24. islands
  25. long
  26. native
  27. predators
  28. prey
  29. rodents
  30. run
  31. settlers
  32. short
  33. species
  34. spite
  35. stoats
  36. stowaway
  37. threatened
  38. thrive
  39. vulnerable
  40. zealand