Peucang Island, which is not inhabited by humans and large carnivores, is a paradise for Javan deer. The 2012 census recorded about 99 Javan deer living on this island . Female deer or doe commonly have their first fawn at the age of two. After that, every year a doe gave birth to a single fawn. Since there are no predators and hunting activities are prohibited on this small and beautiful island, the current number of deer on Peucang Island may reach more than 200.
We can easily meet and observe deer in the 4,150 square meters wide man made grassland on Peucang Island. Located behind NIKKI Cafe. Deer usually visit the grassland every morning and evening to graze. Deer are also often seen lying in the meadow all night. Most of the deer that visit the grassland are doe that do not have antlers. Only a few male deer or stag graze in the meadows. According to the research of Drs. Mufti Sudibyo, M.Si, et al (2012), young stags tend to choose to separate from the herds and choose to explore the forest. They fear other stags that already have hard horns. When two stags meet each other there is a chance of a fight and the antlers of the young stags which are still prone could be breaking. During the mating season, which is from September to December, stags that have broken horns will always give in and not participate in the competition. Meanwhile the stag must always compete by fighting to get the ideal female.