What does the fox say?

Dogs bark, cats meow, and cows moo, but what exactly could you call the sounds (somewhat like a scream/bark hybid) that foxes make? This question has been bugging Norwegian duo Ylvis as well, so they decided to make a song about it. To be honest, their song doesn’t really make a lot of sense, but it can make you laugh and give you a dire case of LSS. Now here's another pressing matter: If a fox meets a friendly horse, do you think they’ll communicate by Morse?

(Screencap via Youtube)