Tsaheylu is a Na'vi word meaning "bond" or neural connection. This describes the physical process by which Pandoran flora and fauna mentally connect to one another by the use of their queues. Tsaheylu has several different uses to different creatures, but primarily, it allows two beings to mentally connect and share information with one another. This information can be verbal communication, such as when a Na'vi issues commands to a banshee or direhorse to direct it without the use of reins, memories, and even sensory data. When two creatures are bonded, they gain access to each other's physical senses; this means they will feel the pain of whatever they are bonded to, among other things. The slinger makes use of this ability greatly, as its head and body are two separate entities connected by their queues, and the body does not possess eyes, meaning it cannot see when its head is disconnected and must navigate with sound. Taming and riding creatures by use of tsaheylu is especially important to the Na'vi, wherein successfully bonding with and learning to ride direhorses, banshees, and other creatures is part of certain rites of passage into adulthood, including Iknimaya. The Na'vi also bond with each other when they mate to create a profound, lifelong spiritual bond with one another. It should be noted that tsaheylu is not considered erotic outside of the context of mating, nor is the queue part of a creature's genitalia. Certain Pandoran florae can also perform tsaheylu with other creatures and plant life; this connection builds the foundations of the Pandoran neural network. This network can be accessed by the Na'vi and presumably other life forms at areas like the Tree of Souls and Tree of Voices; when a Na'vi connects with the network to commune with Eywa, they can upload their own memories and consciousness to the network, and even communicate directly with the spirits of the deceased.