The largest populations of the deer occur on the islands of Busuanga and Culion. However populations are small, with their only being thought to be about 500 animals remaining in the wild. There numbers have fallen because of a loss of their natural habitat and through overhunting by man. They are listed as being endangered by the I.U.C.N. They inhabit open forested areas, and have a preference for swampy areas close to rivers or marshes. In lifestyle they are very similar to the hog deer. They can breed throughout the year. And a single calf is born after an 8 month long gestation period. The young become independent from about a year of age. They are mostly solitary, although sometimes small groups will sometimes gather together for short periods of time. They are mostly active in the early mornings and late evenings, and rest during the greater part of the day.