I remember the first time I saw ducks mating, I'm actually not sure if I knew for sure.  It was two against one so I got a rock and threw it at them to break them up.  The probably went back to business as usual.  I'm trying to say something but can't seem to find the right words!  So are ducks and other non-mammals just get fervent just because it's just a natural drive or do they actually think they are going to experience pleasure?  Maybe I should just shut up now.  It is interesting to know though.  I used to wonder if bugs sleep and looked it up on the internet.  I can't remember what the answer was.  I should have been a biologist of sorts.  It was a favorite subject in high school and college.  I have rabbits.  If anyone wants to ask me about domesticated rabbits I might know the answer!