Université de Neuchâtel

The alarm call system of female Campbell's monkeys

Ouattara, Karim ; Zuberbühler, Klaus ; N'Goran, Koffi J.-N ; Gombert, Jean-Emile

In: Animal Behaviour, 2009, vol. 78, no. 1, p. 35-44

Field studies on male forest guenon alarm-calling behaviour have revealed a number of intricacies about how these primates use vocalizations to protect themselves from predation. In these species, the vocal behaviour of adult females is often different from that of the males, but little systematic work has been done. Here, we describe the alarm call system of female Campbell's monkeys,...

Université de Neuchâtel

Campbell's Monkeys Use Affixation to Alter Call Meaning

Ouattara, Karim ; Lemasson, Alban ; Zuberbühler, Klaus

In: PLoS ONE, 2009, vol. 4, no. 11, p. e7808

Human language has evolved on a biological substrate with phylogenetic roots deep in the primate lineage. Here, we describe a functional analogy to a common morphological process in human speech, affixation, in the alarm calls of free-ranging adult Campbell's monkeys (Cercopithecus campbelli campbelli). We found that male alarm calls are composed of an acoustically variable stem, which...

Université de Neuchâtel

Social learning of vocal structure in a nonhuman primate?

Lemasson, Alban ; Ouattara, Karim ; Petit, Eric J ; Zuberbühler, Klaus

In: BMC Evolutionary Biology, 2011, vol. 11, no. 1, p. 362-368

Non-human primate communication is thought to be fundamentally different from human speech, mainly due to vast differences in vocal control. The lack of these abilities in non-human primates is especially striking if compared to some marine mammals and bird species, which has generated somewhat of an evolutionary conundrum. What are the biological roots and underlying evolutionary pressures...

Université de Neuchâtel

Campbell's monkeys concatenate vocalizations into context-specific call sequences

Ouattara, Karim ; Lemasson, Alban ; Zuberbühler, Klaus

In: Proceedings of the National Academy of Sciences, 2009, vol. 106, no. 51, p. 22026-22031

Primate vocal behavior is often considered irrelevant in modeling human language evolution, mainly because of the caller's limited vocal control and apparent lack of intentional signaling. Here, we present the results of a long-term study on Campbell's monkeys, which has revealed an unrivaled degree of vocal complexity. Adult males produced six different loud call types, which they combined...

Université de Neuchâtel

Speed of call delivery is related to context and caller identity in Campbell’s monkey males

Lemasson, Alban ; Ouattara, Karim ; Bouchet, Hélène ; Zuberbühler, Klaus

In: Naturwissenschaften, 2010, vol. 97, no. 11, p. 1023-1027

Call rate can be a salient feature in animal communication. Depending on the species, different psychological variables appear to influence call rates but the exact nature of these relationships remains poorly explored. Here, we demonstrate for free-ranging Campbell's monkeys that the call rates of four different alarm series (termed H, K, K+, and B series) vary systematically as a...

Université de Neuchâtel

Anti-predator strategies of free-ranging Campbell's monkeys

Ouattara, Karim ; Lemasson, Alban ; Zuberbühler, Klaus

In: Behaviour, 2009, vol. 146, no. 12, p. 1687-1708

Habitat type, predation pressure and reproductive interests are all thought to determine the anti-predator behaviour of non-primates, but only few systematic studies exist. Here, we experimentally elicited anti-predator behaviour in six different groups of forest-living Campbell’s monkeys, using visual and acoustic models of leopards, crowned eagles, and snakes. Individuals produced a variety...

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1 Ouattara, K