For the past several decades it has been proposed that birds show latitudinal variation in
song complexity. How universal this variation may be and what factors generate it, however …

Highlights•Although understudied, recent studies suggest that female birdsong is
widespread.•We compared male and female song using a novel statistical equivalence …

Highlights•Animal vocal learning often involves a period of overproduction and attrition.•We
show young Savannah sparrows sing multiple songs but retain only one as …

Bird song is a culturally transmitted behavioural trait strongly tied to territory defence and
mate attraction in oscine passerines. Divergent song variations can appear in different …

Highlights•We examined geographical variation in male Himalayan leaf-nosed bat
calls.•Male calls showed significant geographical variation across colonies.•Neither …

Divergence in acoustic signals plays an important role in the production and maintenance of
biodiversity in numerous taxa. In this study, we assess patterns of acoustic divergence in …

The geographical variation in animals' social acoustical signals can reduce recognition
across populations and may thus promote assortative mating, reproductive isolation and …

Geographical variation in animals' acoustic signals has received much attention. However,
few studies have compared the patterns and underlying selective forces driving …

Breeding habitat selection strongly affects reproduction and individual fitness. Among birds,
using social cues from conspecifics to select habitat is widespread, but how different types of …

Birdsong can act as a premating barrier to gene flow through its role in mate attraction and
territorial defence. The link between geographic variation in song structure and ecological …