Natural Protegida (ANP), situada en la zona montañosa central del estado. El estudio proporciona nuevos registros del intervalo de distribución altitudinal para esta especie en peligro de extinción, en más de 1 200 m de su límite anterior. Asimismo, se amplía el intervalo conocido de distribución geográfica de la especie más de 50 km al sur del registro más cercano (río Tehucante, Puebla).

Despite that snakes lack outer traces of an auditory system, they respond to acoustic stimuli in the air, in terrestrial substrates and in water, through a functioning cochlea and a somatic system. In reptiles, the use of vibrations has been primarily associated with communication among individuals. However, vibrations also can be a useful mechanism in predator-prey interactions, facilitating efficient hunting. The aim of our study was to examine the ability of horned pitvipers (Ophryacus smaragdinus) to detect and discriminate prey through their vibrations, which were recorded and played back with a transmitter of acoustic waves under a controlled experimental condition. We analyzed the capability of snakes to detect and discriminate potential prey (mouse and lizard) of different sizes, by playing back vibrations that prey species emitted when moving. Our results showed that O. smaragdinus has the ability to detect vibrations of its prey, but it does not discriminate among prey species or size based on the vibrations. We conclude that the auditory system of O. smaragdinus is an important first step to detect prey via vibrations, and that this species likely uses other complementary sensory strategies, such as chemoperception and or thermoperception, for prey recognition.

La sirena menor (Siren intermedia) es registrada por primera vez en Tuxpan, por segunda vez en el estado de Veracruz y por tercera vez en México. Este hallazgo incrementa los puntos de  distribución de la especie, previamente informada para Matamoros y Ciudad Victoria, Tamaulipas y Gutiérrez Zamora, Veracruz. Hasta donde se sabe, esta especie tiene una distribución disyunta en México.