No matter how often we visit, we never get tired of seeing the squirrel monkeys roam their 10,000-square-foot habitat just off the Tropics Trail at the Phoenix Zoo, mostly because this is one exhibit where you can get up close and personal ? no cages involved. Although we've never had one land on our shoulder, we love hanging with the little monkeys (all named with a Star Trek theme, by a Trekkie volunteer), carefully walking through the entrance/exit to make sure none escape and always watching for poop. For once, the animals in the zoo actually look happy to be there ? and we're happy to be there, too.