The exploitation by raptors of large-scale land conversions points out the opportunistic nature of some birds of prey and reminds us that far more raptor management in this country has occurred inadvertently than has occurred purposefully -at least through the decade of the 1970s. Of particular note is the concentration around and extensive use of newly created reservoirs and dam outflows by Ospreys ( Pandion haliaetus ) and Bald Eagles ( Haliaeetus leucocephalus ) (e.g.,