Raptors have excellent vision, yet it is unclear how they use colour information. It has been
suggested that raptors use ultraviolet (UV) reflections from vole urine to find good hunting …

This paper demonstrates that foraging summer-form females of the Japanese yellow
swallowtail butterfly Papilio xuthus have colour vision. The butterflies were trained to feed on …

Influences of light on the locomotor activity and phasing of 42 carnivores from 16 species
were studied on four light regimes employing natural or artificial twilights:(1) outdoor light;(2) …

Colour vision was first demonstrated with behavioural experiments in honeybees 100 years
ago. Since that time a wealth of quality physiological data has shown a highly conserved set …

Vision is considered to be an important component of the sensory system used by
herbivorous insects to locate host plants. We investigated preferences for transmissive …

Many diurnal birds possess a set of four spectrally different types of cone photoreceptor. The
spectral range of vision is extended into the UV by a UV receptor. We have investigated the …

Why leaves of some trees turn red in autumn has puzzled biologists for decades, as just
before leaf fall the pigments causing red coloration are newly synthesized. One idea to …

Butterflies use colour vision when searching for flowers. Unlike the trichromatic retinas of
humans (blue, green and red cones; plus rods) and honeybees (ultraviolet, blue and green …

Publisher Summary The ability of insects to discriminate among different colors was
established beyond doubt just fifty years ago. Scientists and amateurs had investigated color …

That hummingbird-pollinated plants predominantly have red flowers has been known for
decades, but well-investigated research studies are still rare. Preference tests have shown …