One of the most often cited examples of this approach was the sudden decline in the number of raptors, such as hawks and eagles, across much of North America in the 1960s.
(One of the most often cited examples of this approach; was; the sudden decline in the number of raptors, such as hawks and eagles, across much of North America in the 1960s)
One of the most often cited examples of this approach
was
the sudden decline in the number of raptors, such as hawks and eagles, across much of North America in the 1960s