These warts are collections of poison glands. When a toad is attacked, its defense is exuding a milky fluid from these warts which act as an irritant to the mucous membranes of the attacker. The poison does not protect the toad against all predators, for most snakes and birds seem to be unaffected. There are 2 concentrations of the poisonous glands behind each eye. They are known as parotid glands.
Toads have a tympanic membrane on either side of their head right behind the eye.
It is correlated with the ability of toads to produce sounds. The mating call is produced by the pumping of air backward and forward over the vocal cords. When a toad swallows, a peculiar process, involving the closing of the eyes and the sinking of the eyeballs into the roof of the mouth, takes place. This action aids to propel the food into the gullet. Behavior Toads are nocturnal.