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Siamang is a primate of one of the Lesser Ape species originating from Indonesia, and the numbers are becoming fewer, some live in captivity. We want to compare how they behave in the wild and in captivity. This research method used Hanson Checklist for observing grooming, locomotion, vocalization, roaming, nest making, food type, and the mother-child relationship. We observed 6 siamangs in captivity in Surabaya Zoo-- 4 females and 2 males, all adults. Comparative material is the behavior of siamangs in the wild; that we read from the literature. We observed the siamangs for a month, for 8 hours/day. Observation and the note-taking were carried out by the first researcher. We found that siamang in Surabaya Zoo differentiated from their peers in the wild in grooming, vocalization, roaming areas, and food preferences. Differences do not occur in terms of childcare, and nest making. We also noticed the agonistic behavior to the visitors, but not to the keeper and the researcher. We conclude that the behavior of siamangs in captivity changes, but some behavior do not change when compared to those in the wild. The reason is the strength of the environmental factors or the intrinsic factors that influence them.