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Trichechus inunguis is an endemic species of the Amazon, which inhabits mainly in lakes and calm rivers. The objective of this study case was to describe the social behaviour of two female-orphaned calves, of T. inunguis in captivity. They were kept in the same pool at the facilities of the Amazon Rescue Center (ARC, Iquitos, Peruvian Amazon). Between February and October 2011, the individuals were observed during day and night times, completing 352 hours of observation. Through ad libitum observation of the individuals, we developed a catalogue of social behaviors that includes descriptions of 93 behaviours, classified in eight behavioural categories.. The frequency of behaviours was assessed by instantaneous sampling (for states) and continuous recording (for events). Manatees displayed mainly social behaviours, and the most frequent interaction was the simultaneous starting of the same behaviour by both individuals. Most of social behaviours occurred during the day, but ‘group resting’ was recorded mostly at night. ‘synchronized breathing’ and ‘group feeding’ did not have temporary variation between days or between daytimes. Regarding the use of the space, the majority of interactions occurred in shaded places. This study revealed strong interactions between confined calves, suggesting that social activity may play an important role in their learning process. Interacciones entre crias de manati amazonico en Peru: un caso de estudio RESUMEN Trichechus inunguis es una especie endemica del Amazonas que vive principalmente en lagos y rios de aguas tranquilas. El objetivo de este estudio de caso fue describir el comportamiento social de dos crias hembras huerfanas de T. inunguis en cautiverio, mantenidas en el mismo estanque en el Centro de Rescate Amazonico (CREA, Iquitos, Amazonia peruana). Entre febrero y octubre de 2011, las crias fueron observadas durante el dia y la noche, para un total de 352 horas de observacion. Desarrollamos un catalogo de comportamientos social para los individuos mediante observacion ad libitum. La frecuencia de comportamientos fue evaluada por muestreo instantaneo (para estados) y registro continuo (para eventos). Los manaties exhibieron principalmente comportamientos sociales, y la interaccion mas frecuente fue el inicio simultaneo del mismo comportamiento por ambos individuos. La mayoria de los comportamientos sociales ocurrieron durante el dia, pero ‘descanso grupal’ fue registrado mayormente en la noche. ‘respiracion sincronizada’ y ‘alimentacion grupal’ no tuvieron variacion diaria entre dias o entre horas del dia. En lo que respecta al uso de espacio, la mayoria de interacciones ocurrio en lugares sombreados. Este estudio revelo fuertes interacciones entre crias en cautiverio, sugiriendo que la actividad social cumple un rol importante en los procesos de aprendizaje de los manaties.

INTERACTIONS BETWEEN CALVES OF AMAZONIAN MANATEES IN PERU: A STUDY CASE