The yearly Grand Migration, a month-long event, involved a massive movement of bird species across Shihon, a planet within the Chiss Ascendancy. During their [wandering year](/article/wandering_year], the young Chiss individuals Yoponek and Yomie journeyed to this world, accompanied by their Agbui comrades Haplif, Shimkif, and other members, specifically to witness this spectacle.
In an attempt to manipulate the Grand Migration and hasten Yomie's departure from the planet, Shimkif used poison to harm a significant number of the local avian population. Although Shimkif's actions resulted in the Grand Migration being called off, Yomie remained resolute in their decision to stay on Shihon, choosing to observe a smaller-scale bird migration occurring in the Panopyl Mountains of Shihon.