Saguaro cactus grow very slowly. A large saguaro may have many small desert animals living inside of it. The saguaro cactus has sharp spines all over it. The saguaro has folds on its branches and trunk that can hold water for almost two years. The prickly-pear cactus is full of water.
People call it a succulent cactus.
It has thick pads that store water. Each pad is shaped like a pear. The prickly-pear cactus has yellow flowers . It also has sharp spines that keep animals from eating the flower petals. The cholla cactus does not have leaves.