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The animal on the cover of XML in a Nutshell, Third Edition, is a peafowl, the largest bird in the Phasianinae family, which also includes pheasants and turkeys. People often incorrectly call peafowl peacocks. Peacocks are actually male peafowl; the females are called peahens. Two wild peafowl species exist today: the Indian peafowl (Pavo cristatus) and the Green peafowl of Southeast Asia (Pavo muticus), which may be endangered. These wild peafowl live in musters of 8 to 12 birds in dense forest near water. Though they do not fly very well, and do so only for short distances, they do manage to escape most predators and roost peacefully at night, high up in treetops.

The peafowl’s most famous characteristic, of course, is its beautiful fan of feathers, known as a “train.” Each blue-green train feather has a dark spot on its tip that looks much like an eye. Peacocks develop especially brilliant plumage, an indicator of sexual maturity, by age three. A healthy peacock has a full and vibrant train each year during the spring mating season. During this period, peacocks strut their stuff-display their “breeding plumage,” as it is called-to attract peahens. Scientists theorize that the peacock’s performance plays upon the peahen’s instinctive ...

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