What is a kookaburra?

Kookaburra sits in the old gum tree, Merry,merry king of the bush is he, Laugh, Kookaburra, laugh, Kookaburra, Gay your life must be. Kookaburra sits in the old gum tree, eating all the gum drops that he can eat, stop, kookabura, stop,kookaburra, save some there for me. Kookaburra sits in the old gum tree, counting all the monkeys that he can see, stop, kookaburra stop kookaburra, that's no monkey you seeeeee! go to: google.com/videosearch?sourceid=navclient&rlz=1T4DGUS_enUS306US306&q=kookaburra%20song&um=1&ie=UTF-8&sa=N&hl=en&tab=wv#q=kookaburra+song&hl=en&emb=0&start=0">http://video.google.com/videosearch?sourceid=navclient&rlz=1T4DGUS_enUS306US306&q=kookaburra%20song&um=1&ie=UTF-8&sa=N&hl=en&tab=wv#q=kookaburra+song&hl=en&emb=0&start=0