The ability of feathers to perform many functions either simultaneously or at different times
throughout the year or life of a bird is integral to the evolutionary history of birds. Many …

The origin, distribution, and function of biological diversity are fundamental themes of
ecology and evolutionary biology. Research on birds has played a major role in the history …

Animal coloration is one of the most conspicuous aspects of human-perceived organismal
diversity, yet also one of the least understood. In particular, explaining why species have …

Animals tend to decrease in body size (Bergmann's rule) and elongate appendages (Allen's
rule) in warm climates. However, it is unknown whether these patterns depend on each …

Animals produce a wide array of sounds with highly variable acoustic structures. It is
possible to understand the causes and consequences of this variation across taxa with …

Birds exhibit remarkable variation in plumage patterns, both within individual feathers and
among plumage patches. Differences in the size, shape, and location of pigments and …

Models for future environmental change all involve global warming, whether slow or fast.
Predicting how plants and animals will respond to such warming can be aided by using …

Costly interactions between species that arise as a by-product of ancestral similarities in
communication signals are expected to persist only under specific evolutionary …

Convergent local adaptation offers a glimpse into the role of constraint and stochasticity in
adaptive evolution, in particular the extent to which similar genetic mechanisms drive …

We present outcomes from a large-scale air quality citizen science campaign (xAire, 725
measurements) to demonstrate its positive contribution in the interplay between advances in …