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

Unscramble the Blue Letters

But a few flightless birds have survveid on mainlands alongside predators aplenty. Unlike most small flightless species that come and go quickly, these giants have been fhsleltigs for tens of millions of years. Their ancestors appeared around the same time as the first small mammals, and they were probably able to sivrvue because they were evolving— and growing—at the same time as their mammalian poaredtrs. Most of these birds, like emus and ostriches, ballooned in size, weighing herddnus of pounds more than wings can lift. Their legs grew thick, their feet sturdy, and newly dlepoeevd thigh muscles turned them into formidable runners.

Open Cloze

But a few flightless birds have ________ on mainlands alongside predators aplenty. Unlike most small flightless species that come and go quickly, these giants have been __________ for tens of millions of years. Their ancestors appeared around the same time as the first small mammals, and they were probably able to _______ because they were evolving— and growing—at the same time as their mammalian _________. Most of these birds, like emus and ostriches, ballooned in size, weighing ________ of pounds more than wings can lift. Their legs grew thick, their feet sturdy, and newly _________ thigh muscles turned them into formidable runners.

Solution

  1. hundreds
  2. survive
  3. predators
  4. flightless
  5. developed
  6. survived

Original Text

But a few flightless birds have survived on mainlands alongside predators aplenty. Unlike most small flightless species that come and go quickly, these giants have been flightless for tens of millions of years. Their ancestors appeared around the same time as the first small mammals, and they were probably able to survive because they were evolving— and growing—at the same time as their mammalian predators. Most of these birds, like emus and ostriches, ballooned in size, weighing hundreds of pounds more than wings can lift. Their legs grew thick, their feet sturdy, and newly developed thigh muscles turned them into formidable runners.

ngrams of length 2

collocation frequency
bird species 4
flightless birds 3

Important Words

  1. ancestors
  2. aplenty
  3. appeared
  4. ballooned
  5. birds
  6. developed
  7. emus
  8. feet
  9. flightless
  10. formidable
  11. giants
  12. grew
  13. hundreds
  14. legs
  15. lift
  16. mainlands
  17. mammalian
  18. mammals
  19. millions
  20. muscles
  21. newly
  22. ostriches
  23. pounds
  24. predators
  25. quickly
  26. runners
  27. size
  28. small
  29. species
  30. sturdy
  31. survive
  32. survived
  33. tens
  34. thick
  35. thigh
  36. time
  37. turned
  38. weighing
  39. wings
  40. years