Kangaroo cranes, which originated in Australia, are used in high-rise construction projects. Kangaroo cranes are unique in that they are able to raise themselves as the building they are working on increases in height. Kangaroo cranes are anchored by a long leg which runs down an elevator shaft of the building they are constructing. Prior to the invention of Kangaroo Cranes, cranes used in high rise construction had to be disassembled and re-assembled every few stories.
The first time kangaroo cranes were used in the United States was during the construction of the World Trade Center in the 1960’s. They were also used to build the world’s tallest building, the Burj Khalifa.