Behavioral ecologists generally agree that animals derive benefits from familiarity with
spaces that they inhabit or visit, yet site familiarity is rudimentary or lacking in most models of …

Tropical birds offer unique opportunities to test ecological and evolutionary theory because
their life history traits are so diverse and different from temperate zone models upon which …

The evolution of sexually monomorphic (ie mutual) ornamentation has attracted growing
attention as a 'blind‐spot'in evolutionary biology. The popular consensus is that female …

Blood sampling is often critical for answering a variety of questions about wild birds.
However, it is important to assess the impacts, if any, of blood collection on wild birds. Here …

Tropical forest understory birds are declining globally for unknown reasons, indicating an
urgent need to understand the causes. We review and synthesize studies investigating …

Duets are one of the most fascinating displays in animal vocal communication, where two
animals fine-tune the timing of their emissions to create a coordinated signal. Duetting …

The traditionally-defined wren genus Thryothorus is notable for its diversity of singing styles
with some species producing highly coordinated duets or choruses in various formats while …

Lifetime genetic monogamy, by increasing sibling relatedness, has been proposed as an
important causal factor in the evolution of altruism. Monogamy, however, could influence the …

Testosterone promotes aggressive behaviour in male vertebrates during the breeding
season, but the importance of testosterone in female aggression remains unclear …

Comparative research on natural populations of vertebrates, in particular avian species, has
been instrumental in documenting the existence of interspecific variation in the hormonal …