"Controversial "Dead Duck Day" Commemorates Scientist's Observation of Homosexual Necrophilia in Ducks"
Dutch ornithologist Kees Moeliker witnessed a living male mallard duck copulating with a dead male mallard duck, marking the first documented case of homosexual necrophilia in the species. Moeliker's findings won him the 2003 Ig Nobel Prize in Biology and inspired the annual "Dead Duck Day" celebration. Same-sex pairings have been recorded in over 450 different species, and necrophilic behavior has been observed in various animals.