EATING, MATING, BREASTFEEDING, SUCKLING BEHAVIOR OF FRUIT EATING BATS IN EX-SITU /CAPTIVITY. The aim of this study was to understanding about behavior of the frugivores Pteropus alecto especially in ex-situ (captivity). Four adult male bats, 5 adult female bats, and 5 young bats were used in this study. The variable in this study is frequency and duration when doing eating behavior, mate behavior, breastfeeding behavior, and suckling behavior. The result of this study as follows; Eating behavior frequency in a hour 4.12 and duration in minute/hour 3.78 ; Mate behavior in a hour 0.57 and duration minute/hour 0.31; Breastfeeding average frequency in a hour 0.84 and duration minute/hour 2.16; Suckling frequency in a hour 0.69 and duration minute/hour 2.20. Based on the result it can be concluded that the most frequency and duration by sequence is eating, mating, breastfeeding and suckling behavior. Keywords: Bats (Pteropus alecto), Ex-situ Captive, Behavior.