Believed by some to be a variant of the Galapagos Land Iguana, the Santa Fe Land iguana differs by way of its pale yellow color, its shorter snout, and its more dramatic dorsal spine. Found on Santa Fe Island and nowhere else, these lizards are very vulnerable to changes in weather and the introduction of new species, despite their chances of survival being greatly improved by the elimination of feral goats on the island. The Santa Fe Land Iguana is primarily herbivorous but will sometimes incorporate insect and carrion into its diet. It enjoys a symbiotic relationship with the finches of Santa Fe Island, who feed on the tics and parasites that pester the iguanas.
The females lay anywhere from three to eleven eggs at once and they take about 50 days to hatch. Though tough to spot due to their low numbers on the island, those that do see Santa Fe Land Iguanas often find them sunbathing on volcanic rocks. These cold-blooded lizards spend most of their time staying warm. They grow to about three feet in length from tip to tail.