full transcript

From the Ted Talk by Emma Bryce: Why do cats have vertical pupils?

Unscramble the Blue Letters

House cats, for one, are twilight hunters with vtialclery elongated pilups. In the dark, these structures eaxpnd dramatically, taking in the available light. When it’s bright, they shrink into sltis. In fact, cat pupils are so flexible that their maximum area is 135 times gaterer than their mmiiunm area— whereas our pupils only shrink and expand 15-fold. And because of how the slit pupil takes in light, it creates sharp, vertical contours. When the cat’s brain processes the visuals from each eye, the samll but sharp differences between them help the cat judge the precise distance of its tagret. In fact, many other ambush hunters also have vertically elongated pupils— but mainly those whose eyes are located ceslor to the ground. This may be because these pupils are especially useful in perceiving objects at the ralvtiee short distances these animals tend to hunt.

Open Cloze

House cats, for one, are twilight hunters with __________ elongated ______. In the dark, these structures ______ dramatically, taking in the available light. When it’s bright, they shrink into _____. In fact, cat pupils are so flexible that their maximum area is 135 times _______ than their _______ area— whereas our pupils only shrink and expand 15-fold. And because of how the slit pupil takes in light, it creates sharp, vertical contours. When the cat’s brain processes the visuals from each eye, the _____ but sharp differences between them help the cat judge the precise distance of its ______. In fact, many other ambush hunters also have vertically elongated pupils— but mainly those whose eyes are located ______ to the ground. This may be because these pupils are especially useful in perceiving objects at the ________ short distances these animals tend to hunt.

Solution

  1. target
  2. expand
  3. greater
  4. slits
  5. vertically
  6. relative
  7. small
  8. minimum
  9. pupils
  10. closer

Original Text

House cats, for one, are twilight hunters with vertically elongated pupils. In the dark, these structures expand dramatically, taking in the available light. When it’s bright, they shrink into slits. In fact, cat pupils are so flexible that their maximum area is 135 times greater than their minimum area— whereas our pupils only shrink and expand 15-fold. And because of how the slit pupil takes in light, it creates sharp, vertical contours. When the cat’s brain processes the visuals from each eye, the small but sharp differences between them help the cat judge the precise distance of its target. In fact, many other ambush hunters also have vertically elongated pupils— but mainly those whose eyes are located closer to the ground. This may be because these pupils are especially useful in perceiving objects at the relative short distances these animals tend to hunt.

Frequently Occurring Word Combinations

ngrams of length 2

collocation frequency
elongated pupils 3
vertically elongated 2

Important Words

  1. ambush
  2. animals
  3. area
  4. brain
  5. bright
  6. cat
  7. cats
  8. closer
  9. contours
  10. creates
  11. dark
  12. differences
  13. distance
  14. distances
  15. dramatically
  16. elongated
  17. expand
  18. eye
  19. eyes
  20. fact
  21. flexible
  22. greater
  23. ground
  24. house
  25. hunt
  26. hunters
  27. judge
  28. light
  29. located
  30. maximum
  31. minimum
  32. objects
  33. perceiving
  34. precise
  35. processes
  36. pupil
  37. pupils
  38. relative
  39. sharp
  40. short
  41. shrink
  42. slit
  43. slits
  44. small
  45. structures
  46. takes
  47. target
  48. tend
  49. times
  50. twilight
  51. vertical
  52. vertically
  53. visuals