ihicahuaca.

Headword: 
ihicahuaca.
Principal English Translation: 

to warble, to chirp (speaking of a bird) (see Molina)

Orthographic Variants: 
ihicauaca
Alonso de Molina: 

ihicauaca. (pret. oihicacauacaque.) gorjear las aues.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36r. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

Breath is a part of this term, which seems significant, as does bird song across Nahua culture. Nahuatl hieroglyphs of birds very often show them with their mouths open, and some even show them with sound scrolls:
https://aztecglyphs.wired-humanities.org/content/cuauhtliztac-mh483r
https://aztecglyphs.wired-humanities.org/content/cuauhtlahtoa-mdz19r
https://aztecglyphs.wired-humanities.org/content/totonametl-mh536v
https://aztecglyphs.wired-humanities.org/content/tototl-mdz46r
https://aztecglyphs.wired-humanities.org/content/cuixtli-mh503r

An especially beautiful song scroll coming from a bird can be seen in the Digital Florentine Codex, Book 11, folio 55 recto, near the painting of the cuitlacochin.
Digital Florentine Codex/Códice Florentino Digital, edited by Kim N. Richter and Alicia Maria Houtrouw, "Book 11: Earthly Things", fol. 55r, Getty Research Institute, 2023. https://florentinecodex.getty.edu/en/book/11/folio/55r/images/0 Accessed 19 October 2025.

themes: 
Animals, Bugs, Insects, Reptiles, Fish, etc.