It can be tricky in a few situations to differentiate amongst metaphor and simile as literary devices. Equally are figures of speech designed to make comparisons. Entonaba con su voz de canario. (Habla de alguien con una voz fina y agradable como el canto de un canario) A great illustration https://metaforas17406.laowaiblog.com/31787855/the-basic-principles-of-metaforas