Species boundaries of birds across the Euro-Asian continent, especially the widely
distributed passerines with multiple subspecies, are not completely resolved. The Rock …

The striped-back shrew group demonstrates remarkable variation in skull and body size, tail
length, and brightness of the dorsal stripe; and karyotypic and DNA variation has been …

Animals that colonize islands often undergo significant evolutionary changes in comparison
with their continental counterparts as a response to specific island conditions. The pace of …

Simple Summary The distributions of many birds show a northward expansion in response
to climate change. Brownish-flanked Bush Warbler (Horornis fortipes) is such a species …

Acoustic signals used in animal communication play a key role in mate attraction, species
recognition, and territory defense. Variation in acoustic signals may reflect population …

Understanding speciation has long been a fundamental goal of evolutionary biology. It is
widely accepted that speciation requires an interruption of gene flow to generate strong …

Abstract The Long-tailed Rosefinch Carpodacus sibiricus breeds in two widely disjunct
areas in East Asia. Five subspecies are usually recognized. The plumage differences …

Northward expansions of bird distributions have been commonly observed in the Northern
Hemisphere, likely as a result of climate change. The causes and ecological impacts of such …

La comunicación animal mediante señales acústicas tiene un papel importante en varias
actividades primordiales de las especies como la atracción de pareja, reconocimiento de …

Begging brings benefits and costs for nestling birds: it can indicate their needs to their
parents, but it can also be a cue used by predators to find the nest. The costs, like many …