de Bruyn PJN, Tosh CA, Bester MN. 2008. Sexual harassment of a king penguin by an Antarctic fur seal. Journal of Ethology 26(2): 295-297. http://dx.doi.org/10.1007/s10164-007-0073-9
"We report a case of interspecific sexual harassment bridging the rank of vertebrate class."
A seal. A penguin.
You can't make this stuff up.
You could, however, make endless jokes about it. But I won't, since this could devolve oh so quickly.
Unfortunately, our library doesn't have a subscription, so I can't comment in more detail. More commentary, however, can be found in the Zooillogix blog, which had this one first.