The quiz and its results were adapted with permission from the Morningness-Eveningness Questionnaire developed by Michael Terman and his colleagues in 2005, which itself was derived from the original questionnaire introduced by J.A. Horne and O. Ostberg in 1976. The bird labels were added by The New York Times.
Sources:
Michael Terman, a psychologist and chronobiology researcher at the Center for Environmental Therapeutics in New York City
Renske Lok, a chronobiology and sleep researcher at the University of Colorado Boulder
Michael Breus, a clinical psychologist and sleep specialist in Los Angeles
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