Of the approximately 716 bird species that breed in North America, 386 (54%) are
considered Nearctic–Neotropical migrants by the US Fish and Wildlife Service. In the past …

The tropical Andes are characterized by extreme topographic and climatic complexity, which
has likely contributed to their outstanding current species diversity, composed of many range …

Developing conservation and recovery strategies for Nearctic–Neotropical migratory
songbirds requires key research because population-limiting factors remain unknown for …

The behavior of the scarlet ibis (Eudocimus ruber), snowy egret (Egretta thula), and the
whimbrel (Numenius phaeopus) were observed and compared within the salt marsh and …

Setophaga striata, una de las pocas aves migratorias que cría en zonas boreales y migra a
las regiones del Orinoco y el Amazonas, está experimentando un marcado declive …

The nonbreeding period represents a significant part of an Afro‐Palearctic migratory bird's
annual cycle. Decisions such as whether to remain at a single site and whether to return to it …

Bergmann's rule is a well‐established, ecogeographical principle that states that body size
varies positively with latitude, reflecting the thermoregulatory benefits of larger bodies as …

Behavioral flexibility of individuals is essential if organisms are to ultimately adapt to climate
change. As environmental conditions, such as precipitation patterns become increasingly …

Migratory birds complete the stages of the annual cycle (ie, winter, migration, breeding, molt)
in areas thousands of kilometers apart and events in one location can influence subsequent …

Spatial patterns and dynamics are important components in understanding the relation
between animals and their habitat, and how this relation changes over time. Methods for …