Once numbering in the millions worldwide,it is estimated that the wolf has declined to 200,000 in 57 countries, some 11,000 ofthem to be found in the lower 48 United States andAlaska.
A.it is estimated that the wolf has declined to 200,000 in 57 countries, some
B.thewolf is estimated to have declined to 200,000 in 57 countries, with approximately
C.thewolf has declined to an estimate of 200,000 in 57 countries, some
D.wolves have declined toan estimate of 200,000 in 57 countries,
...
A.it is estimated that the wolf has declined to 200,000 in 57 countries, some
B.thewolf is estimated to have declined to 200,000 in 57 countries, with approximately
C.thewolf has declined to an estimate of 200,000 in 57 countries, some
D.wolves have declined toan estimate of 200,000 in 57 countries,
...

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