Rhinanthus minor, the yellow rattle, little yellow rattle or cockscomb, is a flowering plant in the genus Rhinanthus in the family Orobanchaceae, native to Europe, northern North America, and Western Asia. Research at the UK's Centre for Ecology and Hydrology has shown that encouraging yellow rattle to grow in hay meadows greatly increases biodiversity by restricting grass growth and thereby allowing other species to thrive. The seeds are spread very effectively by traditional hay-making practices.