Bald eagle nesting pairs in the US

As bald eagles have recovered, bowling centers have closed, a correlation of -0.987 that suggests either that eagles are bad for the bowling industry or that American culture has simultaneously rewarded conservation and punished recreational bowling with near-perfect inverse precision. The eagle soars, the pins fall for the last time, and the chart draws a gutter ball between ecological triumph and recreational decline.

Eagle nesting pairs grew from about 9,800 to over 71,000 between 2005 and 2021. Bowling centers declined from about 6,500 to under 4,500 during the same period, as the bowling industry lost customers to home entertainment, gaming, and the general decline of mid-century recreational institutions. One metric rises (eagles, via conservation) while the other falls (bowling, via cultural obsolescence), producing a negative correlation by mathematical necessity. The eagle and the bowling ball share nothing except opposite trajectories in the same decade.

Nine years of more eagles and fewer bowling alleys is a portrait of a nation that is getting better at preserving nature and worse at preserving its mid-century leisure culture. The eagle recovers because policy works, the bowling alley closes because Netflix exists, and the chart records both with the spare precision of a coefficient that has rolled a perfect negative game.