This hue is inspired by the blue of a robin’s egg, one of nature’s most recognizable colors. The shade comes from biliverdin, a pigment formed when hemoglobin breaks down in the female robin’s bloodstream and is deposited on the eggshell, producing its distinctive blue-green tone. Scientists suggest the coloration may protect embryos from UV radiation, signal female health to mates, or camouflage eggs in open nests. Studies show males invest more in chicks from brighter eggs, supporting the health-signaling theory, though the full evolutionary advantages remain debated. Beyond biology, robin’s egg blue endures as a cultural symbol of renewal and timeless elegance.