El Caduceo Nature Reserve, located in San Martín, Meta, is an area that has undergone notable modifications in the structural complexity of the vegetation of its forests and savannas due to different farming and livestock activities, which could affect the richness of resident bird communities. This brief study shows an evaluation of the composition and abundance at the level of families and trophic groups of birds in this reserve during the rainy season of 2020. Visual censuses with a time limit were carried out in two stations corresponding to two habitats: gallery forest and savanna with small core forest. Some ecological indices were estimated for each sampling station as well. A total of 18 families were observed, with the Tyrannidae family being more abundant in the savannah, while the Psittacidae family in the gallery forest. The density of birds was higher in the gallery forest (2.19 ind/m2), station in which bird densities are equitably distributed among the recorded families, in contrast to what occurs in the savanna station. On the other hand, the dominant trophic group in both stations were “insectivores.” These preliminary results could indicate a direct relationship between the vegetative structural complexity, the recovery of the gallery forest in this area, and the composition of birds and predominant trophic groups. However, future studies with longer duration and constant monitoring are necessary in order to confirm this introductory observation. ; La Reserva El Caduceo, ubicada en San Martín, Meta, es un área que ha experimentado notables modificaciones en la complejidad estructural de la vegetación de bosques y sabanas debido al efecto de diferentes actividades de cultivo y ganadería, las cuales pueden afectar la riqueza de las comunidades de aves que allí habitan. Este estudio corto muestra una evaluación de la composición y abundancia a nivel de familias y grupos tróficos de aves en esta reserva durante la época lluviosa de 2020. Se llevaron a cabo censos visuales con límite de tiempo en ...