In the past 30 years, carotenoid‐based animal signals have been an intense focus of
research because they can potentially broadcast an honest reflection of individual …

Social hierarchies are ubiquitous in social species and profoundly influence physiology and
behavior. Androgens like testosterone have been strongly linked to social status, yet the …

A central principle in life-history theory is that reproductive effort negatively affects survival.
Costs of reproduction are thought to be physiologically based, but the underlying …

Reproduction is a demanding activity for animals, since they must produce, and in some
cases protect and provision, their young. It is often overlooked that demands of reproduction …

Avian plumage has captivated scientists and the public alike for generations and has been a
fundamental study system for research into signal evolution. By contrast, relatively little …

Species with alternative reproductive tactics typically show pronounced phenotypic variation
between and within sexes. In some species, this variation culminates in discrete …

Oxidative stress is a key physiological mechanism underlying life-history tradeoffs. Here, I
use meta-analytic techniques to test whether sexual differences in oxidative balance are …

Maternal effects provide a mechanism to adapt offspring phenotype and optimize the
mother's fitness to current environmental conditions. Transferring steroids to the yolk is one …

Widespread across open lands and cities of Europe, Africa, and Asia, the common kestrel
(Falco tinnunculus) is one of the most abundant and studied birds of prey. This book brings …

Oxidative stress has been suggested as one of the physiological mechanisms modulating
reproductive effort, including investment in mate choice. Here, we evaluated whether …