Robert Eric Ricklefs (June 6, 1943 - June 7, 2026) was an American ornithologist and ecologist. He was the Curators' Professor of Biology at the University of Missouri, St. Louis from 1996 until August 2019.

Early life and education

Born on June 6, 1943, he grew up near Monterey, California, where his interest in biology was fostered by a teacher. He graduated with a Bachelor of Science

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