ayacachtototl.

Ā-YACACH-TŌTŌ-TL, wrens of the genus Campylorhynchus [FC: 46 Aiacachtototl] “It is tawny. It is called ayacachtototl because its call, which it makes when it sings, is cha cha cha cha, shi shi shi shi, charechi, charechi, cho cho cho cho.” Identified by Friedman et. al. as the Band-backed Wren (Campylorhynchus zonatus). On the basis of their distributions, however, several species of this genus are more likely to have been familiar to the Aztec of the Valley of Mexico, all of which might match the description of plumage and vocalizations. These include Cactus Wren (C. brunneicapillus), Gray-barred Wren (C. megalopterus), Spotted Wren (C. gularis), and Boucard’s Wren (C. jocosus). It is likely the Aztecs applied one name to the various species of the genus Campylorhynchus.
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 11 – Earthly Things, no. 14, Part XII, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1963); Alden H. Miller, Herbert Friedmann, Ludlow Griscom, and Robert T. Moore. “Distributional check-list of the birds of Mexico, Part 2.” Pacific Coast Avifauna No. 33 (1957); and, with quotation selections, synthesis, and analysis here also appearing in E. S. Hunn, "The Aztec Fascination with Birds: Deciphering Sixteenth-Century Sources," unpublished manuscript, 2022, cited here with permission.

See the Florentine Codex for a painting of this bird:
Available at Digital Florentine Codex/Códice Florentino Digital, edited by Kim N. Richter and Alicia Maria Houtrouw, "Book 11: Earthly Things", fol. 49v, Getty Research Institute, 2023. https://florentinecodex.getty.edu/en/book/11/folio/49v/images/ce983b42-2... Accessed 18 October 2025.