What was found
Researchers worked with mated adult female Habronattus pyrrithrix, a jumping spider with three-colour vision. The spiders were trained to associate red with bitter, unpalatable prey while prey brightness was varied separately.
The spiders were then divided between two foraging treatments. In one, red remained a reliable warning that a termite was bitter. In the other, colour did not reveal which prey was palatable.
Spiders given useful red cues directed their attacks toward edible prey more accurately, consumed more palatable termites and tended to waste fewer attacks on bitter prey. During the following 60 days, these females also laid their first egg sac sooner.
Why it matters
Colour vision is usually assumed to help animals find food or avoid defended prey, but directly demonstrating a reproductive benefit is difficult. This experiment connects access to useful colour information with both improved foraging and the timing of egg laying.
The result does not mean that colour vision universally makes an animal more successful. It shows that, in this controlled task, reliable red warning cues helped these spiders make better feeding decisions. That gives researchers a concrete mechanism through which colour vision could provide an evolutionary advantage.
Important caveats
The researchers changed whether colour was informative; they did not disable the spiders' colour vision. The experiment used one species, 49 adult females, painted termite prey and laboratory conditions.
Earlier egg laying did not translate into more egg sacs, eggs or hatchlings during the 60-day study. Females with useful colour cues also tended to be heavier, but that difference narrowly missed the conventional threshold for statistical significance.
Longer studies would be needed to determine whether the earlier egg laying produces a lifetime reproductive advantage. The available paper is also an accepted manuscript and may receive copyediting or formatting changes before its final published version.