pāwa + cocc

Peacock comes from Old English pēacoc — pēa (from Latin pāvō, peafowl) + cocc (male bird, cock). The word separates neatly: pea is the bird, cock is the male. A peahen is the female. A peafowl is the species. The Latin pāvō may come from a Dravidian language — Tamil has tōkai (tail) — since the bird is native to South Asia. The word may have traveled from India through Greek (taṓs) and Latin before reaching English.

The peacock's tail — which is not actually a tail but a train of elongated upper tail covert feathers — is one of the most studied structures in evolutionary biology. Charles Darwin wrote in 1860: 'The sight of a feather in a peacock's tail, whenever I gaze at it, makes me sick.' He was not being aesthetic. The peacock's tail contradicted his theory of natural selection — a structure that makes the bird slower, more visible to predators, and harder to fly should be selected against. The tail's existence demanded an explanation.

Darwin's answer was sexual selection: peahens prefer males with larger, more elaborate tails, so tail size increases despite the survival cost. This theory was controversial for decades. Amotz Zahavi's handicap principle (1975) added a refinement: the tail is honest advertising. Only a genuinely healthy male can afford to carry such an expensive ornament. The tail says 'I am so fit that I can survive despite this burden.' The peacock is showing off, and the showing off is the point.

Peacocks have been kept for ornament since antiquity. Alexander the Great reportedly brought them from India. Roman nobles kept them as garden decorations and served them at banquets. Medieval European nobles displayed them on estates as symbols of immortality (the peacock's flesh was believed not to rot — Augustinus mentioned this). The bird that was native to Indian forests became the ultimate European luxury pet, and the word 'peacock' became a verb meaning to strut and display.