How Yao Hunters and Greater Honeyguides Share a Language in Mozambique

Those trills, grunts and whistles are not merely bushcraft. They make up a shared “language” between people and wild birds that helps lead humans to bees’ nests, and this language seems to divide into regional dialects, much like human speech.

Humans and wild birds hunting together

In the Niassa Special Reserve in northern Mozambique, Yao communities depend on wild honey for nourishment, commerce and traditional ceremonies. Rather than searching at random for hives, they seek assistance.

That assistance is provided by greater honeyguides: small, brown birds with streaked plumage that are adept at locating bees’ nests concealed high in trees or far inside trunks. This is neither a domesticated nor trained relationship, as the birds remain entirely wild.

Humans call to the birds; the birds answer and lead them, tree by tree, to hidden honeybee nests.

When a hunter sees a honeyguide, he makes a recognisable call. Should the bird respond, it produces its own chatter, flies ahead, then stops to call while waiting for the person to catch up. This back-and-forth continues until they arrive at a nest.

At the hive, people carry out the tasks the bird cannot perform. They calm the bees with fire and smoke, break open the nest, and take the honey and comb. Afterwards, honeyguides descend to eat wax and bee larvae, escaping a direct and frequently fatal encounter with thousands of enraged, stinging insects.

A shared code with regional accents

Behavioural ecologist Jessica van der Wal of the University of Cape Town and her research colleagues investigated whether this human–bird language differs between villages in the same area.

The researchers studied 131 skilled honey hunters from 13 Yao villages across the Niassa reserve. They recorded the signals used to call honeyguides and compared them across habitats and geographical distances.

The study found one shared “language” used with honeyguides, split into distinct local dialects that map onto human communities.

In certain villages, hunters made a rolling trill; in others, the signal was closer to a grunt or an ascending whoop. In other places, hunters used a whistle with a distinct rhythm. These differences corresponded with the distance between communities rather than variations in vegetation or terrain.

Hunters relocating to another village generally did not continue with their former bird-call. Instead, they usually took on the local version, resembling the way someone may acquire a new accent after moving to a different city.

What the researchers actually measured

Rather than simply listening casually, the researchers approached honey-hunter calls as they would speech and examined them in a structured way. Their main measures included:

• Pitch and pitch contour (how the sound rises and falls)
• Length and rhythm of the call
• Repetition patterns (single call vs. repeated syllables)
• Acoustic distance between calls from different villages

Assessing these features across dozens of hunters enabled the team to establish that the “dialects” represent community-wide shared patterns, rather than personal peculiarities.

Culture in people - and maybe in birds

For van der Wal and her colleagues, the findings underline the extent to which culture shapes human behaviour, including interactions with wildlife.

Yao hunters already have a common mother tongue and shared social customs. They also possess a specialised “honeyguide language” that is acquired, passed on and shaped locally. Scientifically, this makes it cultural behaviour: it is transmitted socially rather than inherited genetically.

Independent specialists say the most notable finding is that these dialects are unrelated to whether an area is forest or open savannah, despite the expectation that habitat might influence sound transmission. They instead follow the boundaries of human social groups.

Some scientists think the birds themselves could reinforce these local forms. Honeyguides that gradually learn to notice a familiar local signal are likely to locate more nests with people who use it. In contrast, hunters using unusual calls could be ignored more often.

Selection pressure from the birds could help stabilise a mosaic of dialects across human communities.

This produces a feedback cycle: people imitate signals that succeed, while the successful signals are those already understood by honeyguides. Such a cycle may preserve separate dialects for generations, despite occasional movement of people between villages.

How do honeyguides learn the game?

Greater honeyguides introduce a further complication. They are brood parasites: females deposit their eggs in the nests of other bird species and leave unsuspecting foster birds to rear their offspring. Young honeyguides therefore do not encounter their genetic parents.

This makes it unlikely that parent birds teach chicks how to locate humans or cooperate with them. Scientists instead suggest that juveniles may learn by observing adult honeyguides working with people, through instinctive tendencies refined by evolution, or through a combination of the two.

Van der Wal and collaborators in the Pan-African Honeyguide Research Network are now comparing behaviour in several countries. Their goal is to determine whether honeyguides in different areas also favour particular local human calls or interaction styles.

Where this cooperation happens

The Mozambique research provides detailed evidence from a single location, yet honeyguide cooperation occurs in dispersed communities throughout eastern and southern Africa. In some places, the practice is declining as people move towards shop-bought sugar or other ways of making a living.

Why this human–bird partnership matters

For the Yao, this partnership has clear practical value. Honey provides food, medicine and an item for trade. Wax may be used in candles and handicrafts, while bee larvae are a concentrated source of protein. A bird capable of finding hives swiftly saves effort and time across a huge landscape.

For honeyguides, people are strong yet dependable partners. Humans can subdue bees and open resilient tree trunks, allowing the birds to reach wax, a food that very few animals digest efficiently.

More broadly, this collaboration challenges the usual view that human–wildlife relationships involve only conflict or avoidance. Both participants gain without domestication or formal training.

The honeyguide partnership shows that cooperation between humans and wild animals can be stable, intricate and deeply rooted in culture.

Risks, pressures and what could change

Although the Niassa Special Reserve is isolated, it is not unaffected by outside pressures. Changes in land use, logging, climate and the economy could alter bee numbers as well as bird behaviour. Fewer wild bees would mean less food for honeyguides, while a decline in honey hunting among younger Yao people could mean that the calls are no longer learnt.

Under those circumstances, the dialects documented today could disappear in only a few generations. The birds might respond by relying on alternative food sources or by cooperating more with the remaining hunters who still understand the signals.

There is a safety dimension, too. Hunting honey involves burns from fire, stings from disturbed swarms, and falls from tall trees during hive retrieval. A bird that dependably points out active nests can limit aimless walking and unproductive climbing, but it cannot eliminate these dangers.

Some terms and ideas unpacked

Scientists refer to these mutual calls as “cooperative signals”. The vocalisations made by people are not random cries: they are deliberately used to begin a shared activity with another species. The birds’ replies perform a comparable role.

“Dialect” is another important term. Here, it describes a recognisable variation in a shared communication system at community level. The central pattern remains unchanged - a particular category of call directed at honeyguides - but features including rhythm and pitch differ between villages.

Such dialect variation is widespread among humans and has also been identified in creatures including whales and songbirds. The Mozambique research indicates that when two species work closely together, both may become part of a cross-species cultural landscape.

For anyone interested in attempting to “talk to birds” at home, the message is more about patience than copying sounds. A shared code such as that used by Yao hunters and honeyguides seems to have emerged over hundreds or thousands of years through need, environmental conditions and repeated contact.

The research demonstrates that communication between species is more than a fantasy found in nature documentaries. In Niassa’s forests, it occurs whenever a man calls out, a small brown bird responds, and the pair set off to find bees.