Giant Kangaroos are extraterrestrial, faunal mammalianoid organisms native to the planet Cornwood, which happen to have evolved in such a way to resemble Earth's kangaroos, which likely how their name originated. Their joeys are the size of regular kangaroos.
Momon used these creatures to her advantage during her attack on Wipe Castle. Her soldiers rode in their pouches during the attack and threw spears, unicorns and the kangaroos' joeys at the castle. The Great Wizard Greyfarn tried to use a giant boomerang to kill them, but it came back and knocked him down. They have a powerful kick that could destroy a wall. They were likely to have been killed by the Centaurs' arrows.
- Bender's Game