In the 1970s, Nottebohm and Arnold reported marked male-biased sex differences in the
volume of three song control nuclei in songbirds. Subsequently a series of studies on …

In species with mate choice, the choosy sex selects its mate based on traits that are thought
to indicate the mate's quality. In several bird species, females prefer males that sing more …

Many territorial animals are less aggressive towards neighbours than they are towards
strangers. This phenomenon is known as the 'dear enemy'effect and it occurs because …

Contestants use displays to signal their aggressive intent and settle disputes before they
escalate. For birds, this is often in the form of song, which can vary in structural complexity …

The song system of songbirds (oscines) is one of the best studied neuroethological model
systems. So far, it has been treated as a relatively constrained sensorimotor system …

Previous research on songbirds has typically focused on variation in production of vocal
communication signals. These studies have addressed the mechanisms and functional …

Birdsong is an important signal in mate attraction and territorial defence. Quantifying the
complexity of these songs can shed light on individual fitness, sexual selection and …

The song circuit in passerine birds is an outstanding model system for understanding the
relationship between brain morphology and behavior, in part due to varying degrees of sex …

We show that the learned vocalizations of male and female large-billed crows (Corvus
macrorhynchos) are similar and that their functions and physical features show significant …

Birdsong differs from other sexual traits in that the acquisition process involves learning.
Especially in close-ended learning species like the Bengalese finch, conditions experienced …