A male Siamese Brow-antlered Deer, one of three subspecies of Cervus eldii, with the binomial name Cervus eldi siamensis. It has full-sized antlers and is in winter coat, which is dark brown. Its summer coat is orange-red to golden-brown (fig.).

It has strongly curved antlers, of which the main beams grow more backwards than upwards and with a long brow tine, which gave this species its name.