Some clans, such as the Omatikaya, live near groves of willows called Trees of Voices, or Utral Aymokriyä. These sites may also be called Utraya Mokri, presumably a mutated or old form of the name, and are considered swotu (sacred places) by the Na’vi. Prior to any great act, Na’vi will visit Utraya Mokri to entrust their memories to Eywa. The trees form a massive data storage system for the collected memories of departed Na’vi. Some individuals only occasionally link with Utraya Mokri; others may link on a daily basis, ‘uploading’ their thoughts, memories, hopes, and dreams to Eywa.
When a Na’vi has died, their loved ones may go to Utraya Mokri to make tsaheylu with a tree and tireapängkxo (commune) with the deceased. The dead only know and remember things up to the point of the last time they linked to Eywa, via the tree, before their death. It is a bittersweet communion for many. Although living family members can interact once more with their loved ones, the communication is only fleeting and ceases the moment the kuru is untethered. In addition to Na’vi memories, the trees also house ‘memories’ of the rainforest’s wealth of plants and animals.