A paper by (Page et al. 2010) have written that the Mexican axolotl (Ambystoma mexicanum) could be classified as a hopeful monster as it exhibits an adaptive and derived mode of development that has evolved rapidly and independently among tiger salamanders.
Un artigo de Page et al. de 2010 dicía que o anfibio axolote mexicano (Ambystoma mexicanum) podía ser clasificado como un monstro optimista, xa que mostra un modo adaptativo e derivado de desenvolvemento que evolucionou rapidamente e independentemente entre as píntegas tigre.