Among leaves, roots and fallen branches, a group of trumpeters moves in single file, speeds up all at once and changes direction as one unit. The scene can look like a dance, but it belongs to the social life of a bird that specializes in the forest floor. The trumpeter, called jacamim in Brazil, belongs to the genus Psophia, found in the Amazon and other forested areas of South America.
Its body is relatively stocky, its legs are strong, and its short, rounded wings do not favor long flights. Instead of staying high in the canopy, it runs through the understory in search of food, keeps pace with the other members of the group and crosses small clearings with quick strides.
A bird that prefers to run
Flight has not vanished from the trumpeter’s life. The bird can take off to escape a threat, reach a low perch or get past an obstacle, but it does not depend on flying for most of its daily movements. A combination of legs built for walking and wings used in short hops helps explain why the animal is seen close to the ground.
Moving as a group also lowers the risk of an individual being left isolated, keeps members close and lets sound signals travel quickly through the forest. The result is a noisy, coordinated society in which running, calling and following companions are parts of the same survival strategy.
The dance keeps the group together
The behavior described as a dance brings together short runs, approaches and coordinated movements among several trumpeters. Individuals can follow one another across the ground, pause and set off again almost at the same moment. It is not necessary to assign a separate intention to every movement to see its social function. In birds that live in groups, closeness helps maintain contact, reinforces the identity of the flock and makes defense against threats easier.
Collective movement may also make it harder for a predator to pick a target, although the exact benefit varies with the context and with the species of trumpeter observed. The group is not just an occasional gathering of adult birds. It works as a unit that travels, looks for food, reacts to danger and takes part in raising the young.
The vocal repertoire plays a central role in this coordination, because dense vegetation limits sight even when the animals are only a few yards (a few meters) apart. Calls help show where individuals that fell behind are, gather the flock after an interruption and organize responses to risk. The dance can be understood as part of a wider body language, combined with sounds and movements. The forest floor becomes a space for living together, not just an area to pass through.
Several adults feed the same chick
Cooperative breeding is one of the trumpeter’s most striking traits. Rather than all the responsibility resting on the breeding pair, more than one adult takes part in feeding the chicks. The helpers accompany the young, hand over food and help the offspring stay part of the group as it travels over the ground.
This system shares tasks among individuals with different social roles and lets chicks receive care even when the breeding adults are not available at that moment.
That the chicks are raised on the forest floor does not mean the birth necessarily happens in an open nest on the ground. Trumpeters use cavities and protected structures for breeding, and the young begin to follow the adults once they leave the shelter. From then on the group can lead them along trails between the leaf litter and the low vegetation, offering food and protection.
Life on the ground demands constant attention, because predators can approach from several directions. Raising the young collectively adds more watchful eyes and ears and creates a network of care that involves more individuals than just the biological parents. Even so, how much the helpers take part can vary between groups and species.
The alarm travels through the forest community
When a trumpeter detects a threat, its alarm calls can mobilize the group before everyone has seen the danger. The vocalization matters especially in a forest where trunks, leaves and vines block the view. One individual senses the risk and gives the signal; the others may stop moving, draw closer, hide or change direction. The response does not depend only on the size of the animal or the distance to the predator. Sound lets information travel through the environment and reach companions outside the line of sight.
Other species of the forest can also make use of this alarm. By recognizing a vocalization linked to the presence of danger, animals outside the group may become more alert or look for cover. This is known as eavesdropping on signals produced by another species, and it makes the trumpeter a source of information for the understory community. The relationship need not be intentional to benefit the listeners. The trumpeter calls to protect or organize its own group, while other birds and animals interpret the sound according to their own needs. The forest works as a network of shared signals, in which a message can go beyond the limits of whoever produced it.
A behavior tied to the Amazon forest
In the Brazilian Amazon, watching trumpeters means following a little-seen part of biodiversity: the part that moves below the canopy and depends on unbroken forest to run, call and find shelter. Trumpeters live in forest environments where the ground is covered with leaves, roots and low vegetation. Losing that understory could affect not only feeding but also the routes the groups use and the protection of the chicks.
Because the bird depends on intense social interaction, conservation has to consider the space where individuals meet, not just isolated points with tall trees. The common name covers closely related species, and details of vocalization, group size and helper participation can change with the species and the setting.
What remains as a common thread is the combination of legs used for running, an organized social life, cooperative breeding and alarms that can be heard by neighbors of other species. On the forest floor, survival does not depend only on one individual being fast or alert, but on many animals sharing space, signals and responsibilities.
Reporting: Natália Santos / Amazonia Mag
Editor · Amazonia Mag
Anne Silva is the editor of Amazonia Mag, the English-language edition of Revista Amazônia. She curates, translates and adapts the outlet's science and environment coverage for an international audience, reporting on Amazon wildlife, flora, rivers, climate and research. Every story she edits is grounded in peer-reviewed studies, official data and on-the-ground reporting from the Revista Amazônia newsroom in Belém, Pará, Brazil. More by Anne Silva →