The objective of the experiment, using closed-circuit television, was to determine quantitatively some characteristics of vampire bat behavior in cap- tivity. Observations of the time and the manner in which 5 vampire bats performed 4 types of behavior were made. In five 6-hr observation periods the vampire bats averaged 4 hr 58 min resting or sleeping, 34 min grooming, 18 min feeding, and 7 min moving. There was a mean of 260 mouth-body contacts during grooming. SINOPSIS. El objetivo del experimento, lievado a cabo por medio de un circuito cerrado de televisi6n, fu6 determinar cuantitativamente las caracteristicas del comportamiento del vampiro comnin en cautiverio. Se observ6 el tiempo y la forma en que 5 vampiros realizan 4 tipos de comportamiento. En 5 observaciones de 6 horas encontramos los siguientes promedios: descansar, 4 hr 58 min; limpieza, 34 min; alimentaci6n, 18 min y en moverse 7 min. Durante la limpieza hubo un promedio de 260 contactos boca-cuerpo.