The greater one-horned rhinoceros is the largest of the three Asian rhinos and, together with African white rhinos
, is the largest of all rhino species. Males can weigh up to 2.7 tonnes.
The rhinos have a single black horn between 20-60 cm long and a grey-brown hide with skin folds, which give it an armor-plated appearance. The upper lip is semi-prehensile.
Greater one-horned rhinos are solitary, except when sub-adults or adult males gather at wallows or to graze. Males have loosely defined territories which are not well defended, and often overlap.
Females become sexually mature at 5-7 years old, while males mature at about 10. Breeding occurs throughout the year, with a gestation period of 15-16 months. The single offspring remains with the mother until the birth of her next calf, usually after 1 to 3 years.
The rhino is a primarily a grazer. Its diet consists almost entirely of grasses, but it also eats leaves, branches, fruit and aquatic plants.