Widespread in North American forest regions including the Rocky Mountains, the Boreal Owl
(Aegolius funereus) was once the most numerous predatory bird in Eurasian boreal forests …

To understand interspecific patterns in the strength of sexual selection, variation in the costs
and benefits of exercising mate choice needs to be evaluated. One manifestation of sexual …

Sperm competition will be the inevitable consequence of polyandrous mating behavior if two
or more males inseminate a single female. It has been demonstrated for a wide variety of …

Owls (Strigiformes) evolved specific adaptations to their nocturnal predatory lifestyle, such
as asymmetrical ears, a facial disk, and a feather structure allowing silent flight. Owls also …

Warblers (Dendroica caerulescens). However, they did observe a positive relationship
between EPFs and local breeding synchrony. Females with neighbors at similar breeding …

We report on a first DNA fingerprinting study of paternity in a Psittaciform bird, the burrowing
parrot Cyanoliseus patagonus. In two consecutive breeding seasons, a total of 49 families …

Highlights•Previous studies have shown flexibility in the dear enemy effect.•We
hypothesized that flexibility is due to female fertility.•We conducted playbacks to male song …

Urbanization causes widespread endangerment of biodiversity worldwide. However, some
species successfully colonize cities reaching higher densities than in their rural habitats. In …

Pleistocene glaciations greatly affected the distribution of genetic diversity in animal
populations. The Little Owl is widely distributed in temperate regions and could have …

In many bird populations, individuals display one of several genetically inherited colour
morphs. Colour polymorphism can be maintained by several mechanisms one of which …