The Saguaro Cactus is covered with two inch spines located on each of the vertical ribs. The ribs are the lines that run up and down the cactus.
When it rains, the Saguaro Cactus soaks up water and holds it in its ribs. This special ability allows it to survive in the extremely hot and dry desert climate.
Click on this link to learn more about how the Saguaro Cactus stores water. What desert is the Saguaro Cactus most often found in?