On June 5th 1995 at 17:55h, a mallard duck (Anas platyrhynchos) died after colliding with the all glass new wing of the Natural History Museum in Rotterdam. Immediately after falling to the ground, the dead duck was mounted by a (live) duck — also of the male sex. The copulation took 75 minutes, and became known in the scientific community as ‘the first case of homosexual necrophilia in the mallard’. The victim is on display in the museum. Each year on June 5th at 17:55h, just outside the museum, right on the spot where it all happened in 1995, people gather to celebrate ‘Dead Duck Day’.