Flamingos use a natural "makeup" to make their feathers look more vibrant.

Flamingos obtain their primary pink coloration from carotenoid pigments found in the algae and brine shrimp they eat. However, research published in the journal Behavioral Ecology and Sociobiology in 2010 revealed that they also use 'cosmetics' to boost this appearance. The birds produce a reddish-orange oil in their uropygial gland, located at the base of the tail, which contains high concentrations of carotenoids.During the breeding season, flamingos rub their cheeks against this gland and then spread the oil onto their neck, breast, and back feathers. This behavior is most intense just before egg-laying, as a brighter pink color serves as a visual signal of high nutritional status and genetic quality. Scientists observed that more colorful individuals often find mates faster than those with duller plumage.Interestingly, this cosmetic enhancement is not permanent and requires constant reapplication. Once the chicks hatch and the parents begin the demanding process of raising them, the frequency of this 'make-up' application drops significantly. Without the protective oil, the sun's ultraviolet rays bleach the feathers, causing the birds to lose their luster and return to a paler shade.This discovery by researchers at the Doñana Biological Station in Spain highlights a rare example of non-human animals using external substances to manipulate their visual signals. While many animals produce colors internally, the active application of pigments makes flamingos unique in the avian world. This behavior ensures they look their best when the competition for mates is at its peak.