From Halopedia, the Halo wiki
Ibie'sh is a somewhat isolated, volcanic continent on the Kig-Yar homeworld of Eayn, home to the Kig-Yar subtype known as Ibie'shans. The continent is rarely visited by outsiders, leading to the Ibie'shans developing in isolation. The majority of the Kig-Yar serving in Jul 'Mdama's reformed Covenant can trace their ancestry there. More noticeably reptilian than other Kig-Yar, the Jackals of Ibie'sh show the least physical change from the species' common ancestor of all of the three main varieties of Kig-Yar, the other two having evolved more noticeably avian features. They have blunt beaks similar to those of the T'vaoans, though their maws are much larger. Their necks are far more muscular than those of other known Kig-Yar breeds. Despite their major physiological differences, the Ibi'eshans are capable of interbreeding with the other Kig-Yar subtypes and have no marked cognitive differences.