Unbelievable view appealed to me by accident．Just then, I checked once again: the somewhat tiny wood was having a leaf．Could I trust my own eyes? Had the hot sun annoyed me? After all, it as summer in Costa Rica, a country in Central America. I left off, wiping sweat from my eyes．Then I moved the wood with my finger．It stopped．It looked up at me with big triangular eyes．Surprise! It was a mantid, a kind of insect, instead of a piece of wood． The mantid was hanging upside down on a branch．Its wings made it look like a piece of tree bark．Then I noticed something else．The leaf wasn't a leaf at all．The hungry mantid was really eating another insect—a katydid．By now, all that was left of the katydid was a pair of wings．A few moments later, the wings dropped to the ground．The mantid folded its long legs．It sat still．Now it looked even more like a piece of wood than when I had first seen it． I thought about how I had been fooled by these clever animals．Then I thought about how the two insects go about trying to trick each other．Both mantids and katydids are masters of make-up．Katydids are particularly good at it．Many look like something they are not．Katydids often look like plants．Many seem to be leaves．Others look like leaves of grass．All day, the bugs try to stay perfectly still．Because their bodies look like plants, most animals interested in killing them don't bother them while katydids eat plants． 小题1:What is the main topic of the text?
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