Since Darwin's conception of sexual selection theory, scientists have struggled to identify the
evolutionary forces underlying the pervasive differences between male and female …

The ability of feathers to perform many functions either simultaneously or at different times
throughout the year or life of a bird is integral to the evolutionary history of birds. Many …

The spectral sensitivities of avian retinal photoreceptors are examined with respect to
microspectrophotometric measurements of single cells, spectrophotometric measurements …

The first comprehensive review of all aspects of the biology of moult, drawing information
from across the literature and in all birds, from penguins to passerines. Feathers are …

The world in color presents a dazzling dimension of phenotypic variation. Biological interest
in this variation has burgeoned, due to both increased means for quantifying spectral …

The spectral absorption characteristics of the retinal photoreceptors of the blue tit (Parus
caeruleus) and blackbird (Turdus merula) were investigated using microspectrophotometry …

Technological developments in municipal lighting are altering the spectral characteristics of
artificially lit habitats. Little is yet known of the biological consequences of such changes …

Publisher Summary Birds can see ultraviolet (UV) light because, unlike humans, their lenses
and other ocular media transmit UV, and they possess a class of photoreceptor, which is …

Ultraviolet (UV) light occupies the spectral range of wavelengths slightly shorter than those
visible to humans. Because of its shorter wavelength, it is more energetic (and potentially …

Research into the effects of ultraviolet (UV) radiation on terrestrial ecosystems remains a
relatively new discipline that is currently split into two broad themes: the effects of increased …