Mouse, The Kookaburra is a large Australian bird of the Kingfisher family. They have a very distinctive laugh that sounds human. You'll find a web-site with a call easily enough. They become quite tame and will grab meat from the hands of picknickers if they get a chance. In the wild they are meat-eaters - snakes, lizards, fish, small mammals, little birds, eggs. They live in couples or small family groups. They nest in hollow branches of a very specific size and shape. A horizontal space.
Everybody loves Kookaburras. My American husband calls them "coo-coo-burras".

Here, in Australia, a Gum Tree is any tree of the Eucalypt group. In America "Gum Tree' is used for many different trees.
Cheers, Joy