 Little is known of the territorial behaviour of caecilians , but some frogs and salamanders defend home ranges . These are usually feeding , breeding or sheltering sites . Males normally exhibit such behaviour though in some species , females and even juveniles are also involved . Although in many frog species , females are larger than males , this is not the case in most species where males are actively involved in territorial defence . Some of these have specific adaptations such as enlarged teeth for biting or spines on the chest , arms or thumbs . 
