Banteng are social creatures, spending most of their time in herds of two to 40 animals (2), which are usually led by an older cow and accompanied by a single mature male (3). Other males live alone or in bachelor groups (2). While this species may be active during the day or night, the herds have adopted a nocturnal lifestyle in areas of heavy human encroachment (3). Banteng feed mainly on grasses, bamboo, leaves, fruits and young branches of woody shrubs, depending upon the season and availability (2). The single male of the herd reproduces with all the females, and competition for dominance of a herd is therefore fierce (6). Although capable of breeding all year round in captivity, wild banteng in Thailand are known to mate only during the months of May and June (2). Single offspring are born after a gestation period of 285 days. Weaning occurs at six to nine months, and sexual maturity is reached at two to three years. Banteng have been recorded to live up to 20 years in the wild and to over 26 years in captivity (6).