as far as i know, there have never been any kucing on fanpop, so anda may have to ask this pertanyaan in your local shelter for lebih accurate answers.
because kucing hate water and ducks cinta water so the ducks and kucing cant understand each other and the cat thinks he needs to put them out of their missery am i making sense? :)
Same reason southern jepang hates Northern Japan, same reason the Capulets hate the Montegues, same reasion the British and the French hate each other, it is all because of some old grudge that nobody even remembers the reason for.