The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.


extinction; its numbers are now five times greater than

extinction; its numbers are now five times more than

extinction, their numbers now fivefold what they were

extinction, now with fivefold the numbers they had

extinction, now with numbers five times greater than

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Prep2007E2-SC