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Here is an excellent site on the saguaro cactus. Here is a video from Arizona Game & Fish. Here is the Desert Museum's angle for kids. And here's the Nature Conservancy's interactive deserts quiz.
"Judging from his tracks, Boo was about six and a half feet tall, dined on raw squirrels and any cats he could catch. There was a long, jagged scar that ran across his face. His eyes popped and he drooled most of the time." Jem describing Boo Radley in To Kill a Mockingbird "Facts are stubborn things." Tobias Smollett