10.34691/FK2/VSB4D4Reyes-Olivares, ClaudioClaudioReyes-OlivaresVera-Quispe, AlexAlexVera-QuispeZúñiga, AlejandroAlejandroZúñigaUrra, FelixFelixUrraFacultad de Medicina, Instituto de Ciencias BiomédicasRepositorio de datos de investigación de la Universidad de Chile2022Medicine, Health and Life SciencesTachymenisSerpientesUrra, FélixFélixUrraFacultad de Medicina, Instituto de Ciencias Biomédicas2022-04-042023-04-19163629969992448317620224application/octet-streamapplication/octet-streamapplication/octet-stream2.0CC-BY 4.0Several aspects of the antipredatory behaviour of the South American rear-fanged snakes Tachymenis peruviana and T. chilensis coronellina remain still uncertain. In this work, we describe the first records of head-wobble behaviour for T. peruviana and T. ch. coronellina, obtained during fieldwork at Quebrada Ramucho, Tarapacá Region, (3890 m elevation) and El Panul, Coquimbo Region (94 m elevation), Chile, respectively. Moreover, we analyse head-wobble (occurrence, frequency) and other accompanying displays (number of tongue flicks, and total time (s) that they rest, displaced, and moved head backward). T. ch. coronellina specimen exhibited head-wobble with more frequency than T. peruviana, and in both records, we observed wind activity during this antipredatory behaviour.