Behavior of wild vertebrate individuals can vary in response to environmental or social
factors. Such within-individual behavioral variation is often mediated by hormonal …

Singing of songbirds is sensitive to testosterone and its androgenic and estrogenic
metabolites in a species-specific way. The hormonal effects on song pattern are likely …

Many animals differentially express behaviours across the annual cycle as life stages are
coordinated with seasonal environmental conditions. Understanding of the mechanistic …

Almost fifty years ago the advent of assay methods to measure circulating levels of
hormones revolutionized endocrinology in relation to investigations of free-living and captive …

A long-standing tenet of evolutionary endocrinology states that testosterone mediates the life-
history trade-off between mating and paternal care. However, the support for a role of …

Phylogenetically controlled studies across multiple species correct for taxonomic confounds
in physiological performance traits. Therefore, they are preferred over comparisons of two or …

It is increasingly recognized that brain-derived estrogens (neuroestrogens) can regulate
brain physiology and behavior much faster than what was previously known from the …

Territoriality is a common pattern of space use in animals that has fundamental
consequences for ecological processes. In the tropics, all-year resident songbirds usually …

Androgens are known to respond to social challenges and to control the expression of social
behavior and reproductive traits, such as gonadal maturation and sperm production …

In this study, we describe an approach based on an individual's hormonal reactive scope to
study short-term effects of hormones on behavior. The control of territorial aggression has …