TOEFL Listening: TPO-TOEFL阅读TPO - VN_45R1157638HXZN$

In the rain forest, an animal must be able to send signals to members of its own species and at the same time avoid being detected by predators. A. Animals that have different predators at different times of day change color to avoid being detected B. To be noticed, an animal may draw attention to the contrast between its colors and the colors of its environment. C. Yellow and green are the most common colors found in the rainforest. D. To escape notice an animal may move or change color so that its color pattern is not visible E. Animals must have signals for aggression as well as to indicate readiness to mate F. An animal may use sound rather than color to attract attention, because sound signals are not hindered by light conditions