Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: Many species use their body shape and coloration to avoid being detected by predators. The tropical walking stick is an insect with the coloration and body shape of a twig, which makes it very hard to see when it is stationary against a background of real twigs (Figure 19.15a). In another example, the chameleon can change its color to match its surroundings (Figure 19.15b). Answer: predators
A:
Many species use their body shape and coloration to avoid being detected by what?