Figure 55.5 Adaptations to Avoid Being Eaten (A) Porcupines have a coat of sharp spines, or quills, that protect them from predators. (B) Birds searching for insect prey are likely to bypass a katydid that looks like a partially eaten leaf. (C) Nudibranchs (sea slugs) are mollusks without protective shells that may possess stinging nematocysts acquired from their hydrozoan prey. (D) Poison dart frogs of Central and South America sequester highly toxic chemicals in their brightly colored skin.