Animals that occupy temperate and polar regions have specialized traits that help them
survive in harsh, highly seasonal environments. One particularly important adaptation is …

The twenty-first century has witnessed an explosion in research on animal migration, in
large part due to a technological revolution in tracking and remote-sensing technologies …

Millions of migratory birds occupy seasonally favourable breeding grounds in the Arctic, but
we know little about the formation, maintenance and future of the migration routes of Arctic …

Behavioral variation abounds in nature. This variation is important for adaptation and
speciation, but its molecular basis remains elusive. Here, we use a hybrid zone between two …

As is true of virtually every realm of the biological sciences, our understanding of speciation
is increasingly informed by the genomic revolution of the past decade. Investigators can ask …

Seasonal migration is a taxonomically widespread behaviour that integrates across many
traits. The European blackcap exhibits enormous variation in migration and is renowned for …

The evolution of migration routes in birds remains poorly understood as changes in
migration strategies are rarely observed on contemporary timescales. 1–3 The Richard's …

Recent biological analyses suggest that reductions in dispersal ability have been key drivers
of diversification across numerous lineages. We synthesise emerging data to highlight …

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 …

Behavioral changes, such as those involved in mating, foraging, and migration, can
generate reproductive barriers between populations. Birds, in particular, are known for their …