From observations carried out at the end of the rainy season of 1995 and almost the whole dry season of 1996 we registered 38 nests from eighteen bird species belonging to 10 taxonomic families and three orders. Nests found were cup-shaped, globe-shaped, pendulum-shaped, some were in artificial cavities and hole excavated in trees. The cup-shaped type, Myiozetetes similis, Tyrannidae and Passeriformes were the best represented. Vegetal, animal and artificial material as well as soil were incorporated in the nests structure, the vegetal material predominated. Nests were located on 17 plant species Spathodea campanulata followed by Terminalia catappa showed the highest number of nest and bird species. Todirostrum cinereum and Turdus grayi employed the most diverse number of plant species to build their nests over there. The highest number of nests and nesting species were observed in March. Ten eggs from five species were found in six nests as well as ten nests with nestlings from eight species. Four nestlings from two species (Columbina talpacoti and Sicalis flaveola) completed their development successfully. Thirty nests from sixteen species failed mostly during the construction stage. Predators, pruning, neglect, disappearance, winds and drought along with the human population, type of plant holding the nests, their location in the University campus, food availability and pollution from the surrounding city had some effect on the success or failure of the reproductive events. All nests were located at 1.70 to 8.00 meters height; most of them (60. 60%) were located between 2.00 and 4.80 meters. Myiozetetes similis, who built more nests, used to settle them between middle and high elevations. There was a wide variation in nest dimensions. At termination of the observations six active nests remained, with nestlings corresponding to four species.