Many animals use vision to detect, discriminate, or recognize important objects such as prey,
predators, homes, or mates. These objects may differ in color and brightness—having …

To distinguish colors, the nervous system must compare the activity of distinct subtypes of
photoreceptors that are maximally sensitive to different portions of the light spectrum. In …

Birds have impressive physiological adaptations for colour vision, including tetrachromacy
and coloured oil droplets, yet it is not clear exactly how well birds can discriminate the …

Double cones are the most common photoreceptor cell type in most avian retinas, but their
precise functions remain a mystery. Among their suggested functions are luminance …

UV vision is prevalent, but we know little about its utility in common general tasks, as in
resolving habitat structure. Here we visualize vegetated habitats using a multispectral …

The evolutionary relationship between signals and animal senses has broad significance,
with potential consequences for speciation, and for the efficacy and honesty of biological …

Color vision in birds is mediated by four types of cone photoreceptors whose maximal
sensitivities (λmax) are evenly spaced across the light spectrum. In the course of avian …

The brilliantly coloured cone oil droplets of the avian retina function as long-pass cut-off
filters that tune the spectral sensitivity of the photoreceptors and are hypothesized to …

Background Avian collisions with man-made objects and vehicles (eg, buildings, cars,
airplanes, power lines) have increased recently. Lights have been proposed to alert birds …

In many animals, ultraviolet (UV) vision guides navigation, foraging, and communication, but
few studies have addressed the contribution of UV signals to colour vision, or measured UV …