The vertebrate stress response has been shown to suppress investment in reproductive and
immune function and may also lead to a reduced investment in the production of secondary …

Sexual-selection theory posits that ornaments and displays can reflect a signaler's condition,
which in turn is affected both by recent and developmental conditions. Moreover …

Birds communicate their motivation and willingness to escalate a territorial conflict with a
variety of agonistic signals. One of these, song-type switching, has been suggested to be a …

We review work relating glucocorticoids (GCs), male sexual signals, and mate choice by
females to understand the potential for GCs to modulate the expression of sexually selected …

The adrenocortical stress response may divert energy away from sexual ornamentation,
such that ornaments signal exposure or resistance to physiological stress. Alternatively …

When animals are capable of producing variable signals they may preferentially use some
signal types over others. Among songbirds, individuals are known to alter song type form …

Many bird species participate in dawn singing, a behaviour categorized by intensive singing
at dawn; however, many of these species deliver only one song type at dawn. While there …

The relationship between sound complexity and the underlying morphology and physiology
of the vocal organ anatomy is a fundamental component in the evolution of acoustic …

Traditional monitoring methods for colonial waterbirds, such as nest counts, can be
expensive, time‐intensive, disruptive to nesting birds and limited by colony accessibility. Our …

Many studies based on acute short‐term noise exposure have demonstrated that animals
can adjust their vocalizations in response to ambient noise. However, the effects of chronic …