It's a young Grey Butcher Bird - got it's name from the way it catches it's prey and lodges it in a fork in the branches and strips pieces off with it's beak - it does look a little like a Kookaburra but much smaller. It was in my back yard earlier this year ( when I took this shot) and I fed it some mince beef for a while. Most other birds try to force it away, I think they're known to steal new hatched chicks from other birds nests ... and eat them.