The avian bill is a textbook example of how evolution shapes morphology in response to
changing environments. Bills of seed‐specialist finches in particular have been the focus of …

Costs of migration, in terms of time, energy, and mortality risk, have a strong theoretical and
empirical foundation in the study of birds. We expect these costs to be most severe for …

Migrating birds make the longest non‐stop endurance flights in the animal kingdom. Satellite
technology is now providing direct evidence on the lengths and durations of these flights …

Globally, bird migration is occurring earlier in the year, consistent with climate-related
changes in breeding resources. Although often attributed to phenotypic plasticity, there is no …

Patterns of migratory connectivity are a vital yet poorly understood component of the ecology
and evolution of migratory birds. Our ability to accurately characterize patterns of migratory …

Migration movements connect breeding and non-breeding bird populations over the year.
Such links, referred to as migratory connectivity, have important implications for migratory …

Long‐distance migratory species often include multiple breeding populations, with distinct
migration routes, wintering areas and annual‐cycle timing. Detailed knowledge on …

While avian migration timing is clearly influenced by both breeding and non-breeding
geography, it is challenging to identify the relative and interdependent roles of endogenous …

In migratory animals, high mobility may reduce population structure through increased
dispersal and enable adaptive responses to environmental change, whereas rigid migratory …

In a 1998 paper entitled “Guts don't fly: small digestive organs in obese bar-tailed godwits,”
showed that the digestive organs were tiny and the fat loads huge in individuals suspected …