Alarm calls are interesting for both proximate and ultimate reasons. Because of their usually
close connection with relevant events in the environment, they can reveal much about the …

The origins of human language remains a major question in evolutionary science. Unique to
human language is the capacity to flexibly recombine a limited sound set into words and …

This book describes one of our closest relatives, the orangutan, and the only extant great
ape in Asia. It is increasingly clear that orangutan populations show extensive variation in …

The capacity of nonhuman primates to actively modify the acoustic structure of existing
sounds or vocalizations in their repertoire appears limited. Several studies have reported …

Researchers have used sexual selection theory and hypotheses based on intersexual mate
choice and intrasexual mate competition to explain the role of spontaneous long-distance …

Campbell's monkeys (Cercopithecus campbelli) frequently exchange vocalizations, the
combined-harmonic calls, with individuals responding to one another's calls. Previous work …

Despite considerable interest in the vocal communication of non‐human primates and its
possible relevance to theories of language evolution, we know surprisingly little about how …

Acoustic variability and individual distinctiveness of vocal signals are expected to vary with
both their communicative function and the need for individual recognition during social …

Long calls by flanged male Bornean orang‐utans (Pongo pygmaeus wurmbii) serve as a
long‐distance communication signal in this semi‐solitary species and allow individuals to …

Female social dispersal in primates differs from the general mammalian pattern of locational
dispersal. Both nulliparous and parous females may disperse to another group. Several …