Their bodies are bulging, like half peas, with smooth or fluffy coleopters. Usually, black coleopters have red or yellow stripes, or red or yellow coleopters have black stripes, but some ladybugs have yellow, red or brown coleopters without spots. These bright colors are used for vigilance and can scare off natural enemies.
This passage is a description of insects in Insect Tale. By means of metaphor, enumeration and other rhetorical devices, it vividly shows the appearance of insects in front of readers, and vividly shows the reasons why they can scare off natural enemies, which plays a role in clarifying the main idea.