Robot vacuums soldBald eagle nesting pairs in the US
As bald eagles have recovered, robot vacuum sales have grown, a correlation of 0.976 that connects conservation biology to household automation with the patriotic-domestic confidence of a chart that treats eagle nests and Roombas as equivalent forms of American homemaking. The eagle builds its nest, the robot cleans your floor, and both trends measure a nation that is simultaneously rewilding its landscape and automating its living room.
Eagle pairs grew from about 9,800 to over 71,000. Robot vacuums grew from a few hundred thousand to over 20 million units sold between 2005 and 2021. Both nine-year curves. Eagles recover because conservation works; robot vacuums sell because technology becomes affordable. The shared variable is a decade where both nature and technology thrived.
Nine years of eagles and Roombas is the most American domestic-wildlife correlation: the national bird rebuilds its home in the trees while the national gadget cleans the home below, and both trends measure a society investing in different forms of autonomous maintenance. The eagle provides for its young, the Roomba provides for its owner, and both are powered by instinct and algorithms respectively.
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Want to learn more about why correlations like “Robot vacuums sold” vs “Bald eagle nesting pairs in the US” don't prove causation? Read our guide to statistical thinking.