http://anurossp.blogspot.com/2007/06/clase-amphibia_04.htmlhttp://yamileth11.blogspot.com/2008/10/caracteristicas-generales-de-las-ranas.htmlhttps://www.google.com.pe/webhp?sourceid=chrome-instant&rlz=1C1GIGM_enPE577PE592&ion=1&espv=2&ie=UTF-8#q=semejanzas%20entre%20sapos%20y%20salamandrahttp://www.paxala.com/la-salamandra-comun/http://bibliotecadigital.ilce.edu.mx/Colecciones/index.php?clave=insectos&pag=4http://anurossp.blogspot.com/2007/06/clase-amphibia_04.htmlhttp://tatoeba.org/spa/sentences/show/1197943http://respuestas.wikia.com/wiki/Semejanza_de_la_rana_y_salamandrahttps://www.google.com.pe/webhp?sourceid=chrome-instant&rlz=1C1GIGM_enPE577PE592&ion=1&espv=2&ie=UTF-8#q=porque%20las%20ranas%20pierden%20la%20colahttps://www.google.com.pe/webhp?sourceid=chrome-instant&rlz=1C1GIGM_enPE577PE592&ion=1&espv=2&ie=UTF-8#q=caracteristicas%20generales%20de%20la%20salamandrahttp://www.botanical-online.com/animales/salamandra.htm