Although tireless hunters of insects, Frogs themselves are very edible and must evade many predators. In order to protect themselves, many of these small creatures secrete sticky, noxious tasting or smelly mucus. The skins of some frogs even produce poisonous toxins. Used to coat the tips of blowpipe darts and arrowheads, these lethal secretions are prized by Central and South American Indians. Scientists are also investigating toxins that are produced by the poison-arrow frog and hope to discover new treatments that can cure human illnesses.