What examples does Red provide when claiming that "There's a lot of give-and-take in nature" (25)?

Red discusses the way in which "give-and-take" (25) is a crucial element of the natural world. After making this claim, Red states that while woodpeckers beat up his trunk with their beaks, "they also eat annoying pests" (25). Another example given is that grass "cools the earth" (25) but grass also bickers with Red over the distribution of water.