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There are five kinds of apes in the world today. Two of them-gibbons and siamangs are true swingers. They move by brachiation, by swinging like pendulums from branch to branch. Their arms are exceedingly long, their hands and fingers elongated and specialized. Their bodies 5 are short and light, their legs shrunken. With that design-a minimum of weight at the bottom of the pendulum-they can move remarkably rapidly through he tree, swinging from branch to branch with a sureness and smoothness that must be seen to be appreciated, often negotiating, gaps of ten feet or more. When they come to the ground, which is 10 almost never, gibbons stand erect, wadding along on their short, weak legs, holding out their long arms to either side for balance. A strolling gibbon reminds one of a tightrope walker.
1. According to the passage, brachiation is a way of
2. The apes discussed in the passage can most easily travel from place by
3. Based on information in the passage, a gibbon's movement in the trees could best be described as
4. As described in the passage, a strolling gibbon bring to mind a