The Indian muntjacs are classified as omnivores. The same is seen in modern muntjacs. They are superficially similar to the African duikers and the Asian muntjacs, but unrelated. Other larger animals include gibbons, pig-tailed macaques, muntjacs and sambar deer. Female muntjacs (known as "does") become sexually mature within the first year of life. Muntjacs of this time during the Miocene were smaller than their modern counterparts. In the rhinoceros exhibit, Indian rhinoceroses, muntjacs, and oriental small-clawed otters share the outdoor area. Muntjacs exhibit both diurnality and nocturnality. These scent markers allow other muntjacs to know whether a territory is occupied or not. The body length of muntjacs varies from , and height ranges from . Hairy-fronted muntjacs are extremely difficult to study because of their shyness. Muntjacs are known for their soft hide and tender meat.