Recent studies have shown that certain nocturnal insect and vertebrate species have true
color vision under nocturnal illumination. Thus, their vision is potentially affected by changes …

Diurnal and nocturnal hawkmoths have been shown to use colour vision for flower
discrimination. Here, we present evidence that the nocturnal hawkmoth Deilephila elpenor …

The ability to see colour at night is known only from a handful of animals. First discovered in
the elephant hawk moth Deilephila elpenor, nocturnal colour vision is now known from two …

Diurnal and nocturnal hawkmoths (Sphingidae, Lepidoptera) have three spectral types of
receptor sensitive to ultraviolet, blue and green light. As avid flower visitors and pollinators …

The dual retina of humans and most vertebrates consists of multiple types of cone for colour
vision in bright light and one single type of rod, leaving these animals colour-blind at night …

Honeybees, like humans and most other vertebrates, are colour-blind in dim light. Bees are
primarily day-active and have apposition compound eyes, the typical eye design of diurnal …

Variation of visual signal coloration has been predicted among closely related species or
populations by the sensory drive hypothesis and tested in fishes, reptiles, or birds. However …

Humans are colour-blind at night, and it has been assumed that this is true of all animals.
But colour vision is as useful for discriminating objects at night as it is during the day. Here …

Budgerigars, Melopsittacus undulatus, were trained to discriminate monochromatic lights
from mixtures of two comparison lights. The addition of small amounts of UV (365 nm) to …

Individual bumblebees were trained to choose between rewarded target flowers and non-
rewarded distractor flowers in a controlled illumination laboratory. Bees learnt to …