Iguanas can grow up to 7 feet long with their whip-like tails making up about half of their total length. Like other reptiles, iguanas are cold-blooded, egg-laying animals with an excellent ability to adapt to their environment. Our big green foam iguana is 40 inches long resembling the live iguana featured in Darwin on exhibit at The Field Museum June 18, 2006 through January 1 2008