Total golf courses in the US

As bald eagles have recovered, golf courses have declined, a negative correlation of -0.981 that suggests either that eagles are hostile to golf or that the same land-use changes supporting eagle recovery are destroying the golf industry. The eagle nests in the tree beside the 7th hole, the fairway is converted to a housing development, and the chart records both with the birdie precision of a coefficient that has never played 18 holes.

Eagle pairs grew from about 9,800 to over 71,000. Golf courses declined from about 16,000 to under 14,000 as the sport contracted—baby boomers aged out of the game, younger players preferred TopGolf and simulators, and the land occupied by golf courses became more valuable as real estate. Eagles benefited from some of the same land-use changes: abandoned golf courses can become wildlife habitat, and the general greening of suburban landscapes created more nesting opportunities. The negative correlation captures a genuine ecological dynamic: as one form of land use declines, another form of wildlife can thrive.

Nine years of more eagles and fewer golf courses is a correlation with a whisper of real mechanism: abandoned recreational land becomes wildlife habitat, and a recovering species takes advantage. The eagle scouts the former fairway, the developer eyes the acreage, and the chart records a transition that is partly ecological, partly economic, and entirely American. The handicap improves. The wingspan extends. The par is set by nature.