Kaadu were large, flightless waterfowl that lived in the swamps of the planet Naboo. Gungans used them as mounts.
The kaadu was a two-legged reptavian at home both on land and in the water: they were excellent runners and strong swimmers, as they had a lung capacity allowing them to remain underwater for up to two hours. Kaadu females laid their eggs on land, often in fields. As predators such as the peko-peko were known to eat kaadu eggs, the average clutch of eggs was large, ensuring at least some of the younglings survived. Kaadu had sharp hearing and a keen sense of smell.
Kaadu were known to be fearless creatures, and many were domesticated by Gungan warriors as steeds during times of conflict, or as patrol animals to police the Gungan cities. Kaadu were highly loyal to their owners, and it was said that a Gungan and his kaadu made an inseperable team. Warriors often decorated their steeds with huge goff feathers. Officers of the Gungan Grand Army rode into battle against the Trade Federation during the Battle of Naboo upon their kaadu mounts.