Nationally, bald eagle populations are rising to the point where the federal government has recommended removing the species from the endangered list.
Florida trails only Alaska and Washington State in the size of its eagle population, estimated at 1,000.
Additionally, power lines cause a frequent electrocution, which results in death for the majority of the eagle population.
As with size, the average lifespan of an eagle population appears to be influenced by its location and access to prey.
For decades the country's bald eagle population teetered on the edge of extinction.
The bald eagle population has rejuvenated since the 1970's; there are 3,980 in Illinois, according to a recent count.
With the purchase, the state concluded a 15-year program to restore its bald eagle population.
But in a written narrative on the status of the state's bald eagle population, he has warned that the bird remains threatened by habitat loss.
Over time, pollution and habitat destruction caused a decline in the bald eagle population.
In the 1960s the bald eagle population in the forest was only 12 nesting pairs.