Gaur n. : An East Indian species of wild cattle (Bibos gauris), of large size and an untamable disposition.

Example:
How do tigers kill huge prey like Gaur (indian bison) which are huge and very strong themselves.?

Taxonomy
gaur, Bos, Bos gaurus, gaurs, tiger, herd, species, subspecies, horns, bulls, Bos frontalis, adult, forests, populations, females, cow, Family Bovidae, Bibos.

Defination from the web:
gaur (pronounced /ˈɡaʊr/) (Bos gaurus, previously Bibos gauris) is a large, dark-coated bovine animal of South Asia and Southeast Asia. ... The gaur is the largest species of wild cattle, bigger than the Cape buffalo, water buffalo and bison. ...