On 5 June 1995 an adult male mallard (Anas platyrhynchos) collided with the glass façade of the Natuurmuseum Rotterdam and died. An other drake mallard raped the corpse almost continuously for 75 minutes. Then the author disturbed the scene and secured the dead duck. Dissection showed that the rape-victim indeed was of the male sex. It is concluded that the mallards were engaged in an ‘Attempted Rape Flight’ that resulted in the first described case of homosexual necrophilia in the mallard.
http://www.nmr.nl/deins815.htm
for those who can read dutch and understand it 
http://www.nmr.nl/
i read about this news about a week ago in the Spits. Apparantly the author has been awarded a prize: ‘the most non-useful research of the year’. He has been invited to Harvard to pick up his prize.