 Kzin

The Kzinti (singular Kzin) are a fictional, very warlike and bloodthirsty race of cat-like aliens in Larry Niven's "Known Space" series.The Kzinti were initially introduced in Niven's story "The Warriors" (originally in "Worlds of If" (1966), collected in "Tales of Known Space" (1975)) and "The Soft Weapon" (1967), collected in "Neutron Star" (1968).