Down Under Kookaburra rip off?

Kookaburra sits in the old gum tree/Merry, merry king of the bush is he/Laugh Kookaburra, Laugh Kookaburra/Gay your life must be.

Anyone who sat round Girl Guide campfires will remember that (and just in case there’s a young reader out there, gay in that context just meant happy).

It must be decades since I sang it, but it all came back when I read that lawyers reckon that the classic Aussie pop song Land Down Under by Men at Work is a rip-off  of the Kookaburra song.

Similar maybe, but it would take someone with much better grasp of melody and rhythm than I’ve got to argue whether or not it’s a rip-off.