Input (grade 13): It is estimated that in the early 18th century, the Bald Eagle population was 300,000 â "500,000, but by the 1950s there were only 412 nesting pairs in the 48 contiguous states of the US.
Output (grade 9): In the early 1700s, the number of bald eagles were 300,000 â "500,000, but by the 1950s there were only 412 nesting pairs in the United States.