Original sentence: The North American beaver population was once more than 60 million, but as of 1989 was 6–12 million.The beaver became extinct in Great Britain in the sixteenth century: Giraldus Cambrensis reported in 1189 (Itinerarium ii
Edited sentence: The North American beaver population was once more than 60 million, but as of 1988 was 6–12 million.The beaver became extinct in Great Britain in the sixteenth century: Giraldus Cambrensis reported in 1188 (Itinerarium ii