One example of a characteristic that has been evolved is escape behavior. Escape behavior is when a prey senses the presence of a predator and then attempt to leave the area. A terrestrial caecilian will dig into the soil quickly when it senses a predator. When an aquatic caecilian meets a predator, it will spit a small blob of water. Also, it will produce large quantities of mucus, which make it very difficult to hold.
Some caecilians are capable of inflicting painful bites and some have poisonous secretions.
A salamander will get into the position known as the Unken reflex. This is a immobile posture when the chin and tail are elevated. Toxic skin secretions come from the glands and cover the salamander. Salamanders also lash their tails at a predator. Toxic secretions also cover the tail.