Jivaroan peoples refers to groups of indigenous peoples in the headwaters of the Marañon River and its tributaries, in northern Peru and eastern Ecuador. They speak one of the language family of the same name.
The Jivaro people are famous for their head-hunting raids and shrinking the heads. These raids usually occur once a year in one particular Jivaro neighborhood. The raiding parties usually only attack one homestead per raid, killing the men, spearing the older women to death, and taking younger women as brides.
Jivaro also engage in hunting activities. These activities usually involve a husband and wife hunting with a blow gun and poisoned dart, dabbed with the poisonous plant curare, which stops the heartbeat of the animal. Jivaro usually hunt for monkeys and birds, but they do not rely on hunting as their primary food source.
The principal groups are:
Some have also named the following:
The Jivaroan worldview is built upon the idea that both animate and inanimate objects hold souls that cannot be seen by our common eyes. These souls contain power, or karáram, that the Jivaroan people believe can be contained and harnessed within one’s self. Harner talks about these souls, called arutam:
“A person is not born with an arutam soul. Such a soul must be acquired, and in certain traditional ways. The acquisition of this type of soul is considered to be so important to an adult male’s survival that a boy’s parents do not expect him to live past puberty without one. By repeatedly killing, one can continually accumulate power through the replacement of old arutam souls with new ones. This “trade-in” mechanism is an important feature because, when a person has had the same arutam soul for four or five years, it tends to leave its sleeping possessor to wander nightly through the forest. Sooner or later, while it is thus drifting through the trees, another Jivaro will “steal” it. Accordingly, it is highly desirable to obtain a new soul before the old one begins nocturnal wanderings. This felt need encourages the individual to participate in a killing expedition every few years.”
Killing becomes a vital part of the Jivaro culture. Men are only marriageable after becoming hunters within their communities. The more one kills, the more power one has, granting one immunity of death. Violence is a huge part of Jivaroan culture in respect to this type of soul belief. Harner talks about the main systems of belief within the Jivaroan communities:
“Jivaro souls beliefs constitute one of four major autonomous systems of verbalized thought so far noted in their culture. The other three are the systems of crop fairy (nungui) beliefs, and kinship system. Since belief in one system is not explicitly based upon belief in another, an adequate understanding of Jivaro soul beliefs can be achieved without recourse to the beliefs regarding nunui, witchcraft, or kinship.”
The Jivaroan people have a polytheistic religion. The Jivaro god, Tsungi, is the god of shamanism, and the Jivaro goddess, Nungüi, refers to mother earth. Nungüi is described as being a short and heavy-set woman, dressed in a black dress. According to Jivaro belief; if Nungüi dances in a woman's garden, it will be productive during the harvest season. Living deep underground, she emerges at night to dance in the gardens. Women sing to Nungui to ask her to protect the gardens, and they carefully weed the gardens daily to appease her. Jivaro believe in a protective spirit that comes to them through spirit visions. This spirit, known as Arutam is thought to protect them from injury, disease, and death. The Jivaroan gods and goddesses are deeply tied to nature. There are different creators and gods that explain the origins of man and animal, the occurrence of natural events and relationships that exist in daily life. Their creation myths support their violent culture as “it is dominated by a series of battles among the gods and an essential duality of where people are the victims.” Among the deities are spirits that are known to provide wisdom and protection to the person they are tied to. Some commonly seen animals are the anaconda, pangi, and the giant butterfly wampang. These animals can assist shamans in healing or bewitching people. Through the Jivaroan worldview, it is believed that sickness and death are caused by attacks on one’s spirit by malevolent shamans. The healing shamans will hold ayahuasca ceremonies and perform different rituals to counteract the work done by witchcraft.
See: Shrunken Head
Unlike many other cultures, the Jivaro cultures place more emphasis on gardening (horticulture) than they do on hunting. This is due to the unpredictable nature of hunting in the Amazonian region, where the Jivaro call home. As a result, a ritualistic approach to gardening sprouted from the Jivaro cultures.
Despite the reliable, elaborate system of horticultural development the Jivaro have developed, they still believe the act to be “…as fraught with uncertainty as hunting” as Michael Brown stated in a paper titled, “Aguaruna Jivaro Gardening Magic in Alto Rio Mayo, Peru.” He then went on to say that in order, “To encourage the growth of their cultivated plants they sing magical gardening songs, perform a set of ritual acts when planting a new garden, and observe certain taboos connected with garden work.” Much like similar beliefs and rituals associated with hunting, the Jivaro believe that spirits reside in the plants and they need to be encouraged to grow by various songs, chants, and dances.
Owing to the belief of spirits residing in the plants, the garden is regarded as a place of great spiritual significance. Like the inside of a temple, the garden is a place where one receives sanctuary.
"It is one of the few places where a woman can go alone without attracting curiosity and suspicion. It offers privacy from prying eyes and ears and is therefore the site of a certain amount of intra- and extra-marital sexual activity" (Brown, 171)
Ayahuasca ceremonies play a large role in the Jivaro culture. These ceremonies are used for healing practices usually directed toward enchanting spirits. Here, Bradley C. Bennett makes note of these healing practices,
"During Healing Ceremony, only shaman and patient drink Natem and will participate in the singing and chanting while the shaman will perform different actions to the patients body thought to heal the spirit."
The shaman goes about relieving the patient of any harmful spirits that may be attacking his or her body. The Jivaro also believe in an act of what may be considered telling the future or telling time. Bennett makes another note of the Jivaro and their ayahuasca ceremonies, where a Jivaro will hire a shaman to tell of far away friends and family.
"The Jivaro shamans, Under the influence of ayahuasca, often believe that they are seeing distant relatives or sweethearts. These distant persons apparently have to be individuals with whom the shaman is already acquainted, so that he can "know whom to look for." Also it is normally necessary for the shaman to be already acquainted with the distant locale and the route to get there, and preferably he should know the appearance and location of the house of the person being sought." 
The Jivaro have been practicing these ceremonies for hundreds of years, keeping them held close to their roots. The ceremonies of the ayahuasca brew continue to be practiced this day.
The Shuar believe that the first being, Tensak, casts a spiritual dart that to curse or heal a person. Bennett recorded that the Tensak "exists in a higher plane of existence that can be seen when in the shaman state." Bennett also observed that, as a shaman works to heal spirits and counter bewitching shamans he will consume Banisteriopsis caapi, tobacco and alcohol to help enhance and fuel his trip from the Natem.
Anthropologists have recognized these languages[which?] as distinct peoples, but have called attention to two confounding factors. The first has to do with nomenclature: Jivaroan language speakers typically identify themselves either by their language's word for person (shuar) or by the name of the river on which they live. Consequently, historical sources record either one name for all, or a plethora names of many small Jivaroan tribes, each the name of a different river.
The second reason has to do with social organization. Prior to Ecuadorian or Peruvian colonization and Christian missionization in the 20th century, the principal unit of Jivaroan social organization was the polygynous matrilocal household or cluster of matrilocally-organized households. Notably, although Jivaroans shared the same language and culture, each household or cluster of matrilocally organized households were politically and economically autonomous. Thus, in 1938 Matthew Stirling commented that:
the Jivaros scattered over this vast territory of approximately 22,000 square miles (57,000 km2) are of similar appearance physically; they speak a single language and their customs, beliefs and material culture are closely interrelated. With this, however, their unity ends. The scores of small independent groups, living for the most part on the headwaters of the tributary streams, are constantly at war, one group with another.
He also said that:
...they live in widely separated household groups with very little consciousness of any sort of political unity. Such groupings as exist are continually shifting location, separating, amalgamating, or being exterminated.
Prior to colonization and the presence of Christian missionaries, Jivaroan speakers were not organized into any stable and clearly bounded polities or ethnic groups.
In response to European colonization and missionization, Jivaroan speakers have formed nucleated settlements that are organized into political federations: the Federación Interprovincial de Centros Shuar and the Nacionalidad Achuar de Ecuador in Ecuador, and the Organización Central de Comunidades Aguarunas del Alto Marañon and the Consejo Aguaruna y Huambisa in Peru.
At the time of Spanish arrival to South America, the Jivaro were an independent culture and hostile to outsiders. The neighboring Incas tried to subjugate the Jivaroan peoples, but the Inca Empire's expansion attempts failed after a series of bloody confrontations where the Inca army lost against the fierce Jivaroan warriors. The Jivaro put up a similar resistance to Spaniards, who came into their territory searching for placer gold. Until the middle of the nineteenth century, the Jivaroan tribes had only limited and intermittent contact with the Spanish.
The strong warrior culture of the Jivaroan tribes and its striking power is illustrated in the famous Jivaro-Spanish war of 1559 when perhaps as many as 20,000 Jivaroan warriors under the leadership of Quiruba annihilated the town of Logroño, terminating Spanish incursion into Jivaro territory. Not even Peruvians or Ecuadorians succeeded in making headway in this area some fifty years ago.
The word "Jivaro" is likely a corruption of xivar, a word that means “people” in the Shuar Chicham language. During the Spanish colonial period, "Jivaros" were viewed as the antithesis of civilized. The word Jíbaro thus entered the Spanish language; in Ecuador it is highly pejorative and signifies "savage"; outside of Ecuador, especially in Mexico and Puerto Rico, it has come to mean "rustic."