 These lizards varied in length from , with skin colors ranging from a steely gray to a dark green and even brown, and possessed a bony-plated pseudo-horn or outgrowth which resembled the horn of a rhinoceros.Navassa Island was visited in 1966 and 1967 and no animals were present.An entomologist visited the island again in 1986 and saw no signs of any iguanas although he was not specifically looking for them.