
Source: Wikimedia Commons
Ctenosaura similis
The largest species of Ctenosaura, with males reaching 1.3 m. Keeled black spiny scales ring the tail. It holds the record as the fastest lizard, favours rocky habitat and is a diurnal, largely herbivorous omnivore.
Ctenosaura similis is an iguanid lizard ranging from southern Mexico through Central America and the largest species in its genus. Males reach 1.3 m in total length, females a slightly smaller 0.8 to 1 m. Keeled black spiny scales ring the tail, giving the species its common name, and a crest of long spines runs down the middle of the back. Colour varies greatly even within one population, but adults usually have a whitish grey or tan ground colour with four to twelve well-defined dark dorsal bands. Breeding males develop orange around the head and throat with blue and peach highlights on the jowls. It lives in grassland and forest from sea level to about 1,320 m, prefers rocky habitat with crevices to hide in, and readily climbs nearby trees. It is diurnal and fast, its maximum sprint of 34.6 km per hour standing as the record for the fastest lizard; cornered animals lash with the tail and bite. Adults are largely herbivorous, eating flowers, leaves, stems and fruit. It has established an introduced population in Florida.
Source: Wikipedia (CC BY-SA 4.0)
The Black Spiny-Tailed Iguana lives 15-25 years.
The Black Spiny-Tailed Iguana grows to Males up to 1.3m, females 0.8-1m in total length.
Origin
Southern Mexico through Central America to Panama, plus Colombian islands; introduced to Florida and Venezuela
Lifespan
15-25 years
Size
Sources: Reptiles Magazine: Spiny-Tailed Iguana Care Sheet / Reptiles Magazine: Breeding Spiny-Tailed Iguanas of the Genus Ctenosaura / Wikipedia (English) / Reptile Database
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Ctenosaura similis (Gray, 1831)
Synonyms: Iguana similis Gray, 1830, Ctenosaura completa Bocourt, 1874
Authority databases: GBIF · Reptile Database
Nomenclature follows global taxonomic authority databases.
The genus Ctenosaura spp. has been listed in CITES Appendix II since February 12, 2020. As an Appendix II species, registration certificates for species designated as international rare wild animals and plants are not required; however, import requires an export permit issued by the exporting country. It is not included in the special animals listed in the table of the Ordinance for the Enforcement of the Act on Welfare and Management of Animals, nor in the designated invasive alien species under the Invasive Alien Species Act.
Sources: CITES Appendices (Ctenosaura spp., Appendix II, effective 12 February 2020) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Males up to 1.3m, females 0.8-1m in total length
Humidity
40〜70%
Mainly plant matter such as leaves, flowers, stems and fruit, with insects and small animals taken opportunistically
Published figures give an enclosure air temperature of 24-29C with a basking area of 35-41C. Mist in the morning to reproduce the high morning humidity of its native habitat. As a sun-loving diurnal lizard it needs UVB lighting running over at least two-thirds of the enclosure length.
A single animal or a pair is commonly housed in an enclosure of roughly 240 x 60 x 60 cm, or 240 x 60 x 75 cm. As a rock-dwelling species it needs flat stones and driftwood arranged into crevices it can wedge into, along with basking surfaces and branches to climb. Provide a water bowl heavy enough not to tip over.
Adults are largely herbivorous, taking flowers, leaves, stems and fruit and eating insects or small animals opportunistically. In captivity base the diet on leafy greens and flowers and keep animal matter as a supplement. Any plants placed in the enclosure should be non-toxic, since they will be eaten.
It is extremely fast and, when cornered, lashes with its tail and bites. It is large and powerful, so handling requires patience and care. Males fight and must not be housed together.
Ctenosaura spp. have been listed on CITES Appendix II since 12 February 2020, so import requires an export permit from the exporting country; Appendix II animals need no Japanese registration certificate. It is neither a specified animal nor an invasive alien species under Japanese law. Given that it reaches 1.3 m and is powerful, secure housing and a plan for its whole life before acquiring one.
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The average lifespan of Black Spiny-Tailed Iguana is 15-25 years. With proper care and nutrition, they can live a long and healthy life.
Black Spiny-Tailed Iguana typically reaches Males up to 1.3m, females 0.8-1m in total length as an adult. Size may vary depending on care conditions and individual genetics.
Black Spiny-Tailed Iguana feeds on: Mainly plant matter such as leaves, flowers, stems and fruit, with insects and small animals taken opportunistically. Aim for a balanced diet with appropriate feeding frequency.
The price of Black Spiny-Tailed Iguana varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 28, 2026