Green iguana (Iguana iguana): description, behavior, and human interactions

Physical characteristics

Green iguanas are recognized by a row of dorsal spines running from the neck to the tail, a large throat fan or dewlap, and a long laterally compressed tail that can serve as a whip-like defense. Adults commonly reach substantial lengths, with the tail making up much of that distance. Color varies: many juveniles are bright green, while adults often show greener, brown, or tinged orange tones depending on age, sex and locality. Their sharp claws and muscular limbs make them strong climbers, facilitating an arboreal lifestyle.

Diet and behaviour

Primarily herbivorous, green iguanas feed mainly on leaves, flowers and fruits, although young animals may occasionally take animal prey. They are active by day, sunbathe to regulate body temperature, and retreat to trees or water when threatened; green iguanas are competent swimmers and can evade predators by diving. Males display territorial and mating behaviours that include head-bobbing, dewlap extension and color changes.

Reproduction and life cycle

Breeding is seasonal in many parts of the range. Females dig nests in soft soil or sand, laying clutches of eggs that develop outside the body. Hatchlings emerge fully formed and begin climbing and feeding soon after. Growth to adult size may take several years; sexual maturity and lifespan vary by population and environmental conditions.

Human interactions, distribution and conservation

Green iguanas are popular in the pet trade and are kept worldwide, which has led to introduced populations outside their native range. In places such as parts of the United States and some Pacific islands they have become invasive, causing ecological and infrastructural issues through grazing and burrowing. As a widely distributed species, their conservation status is complex: populations are abundant in many areas but can decline locally from habitat loss and hunting. The green iguana shares its genus with other species referenced under Iguana and broader taxonomic resources at Iguana-related pages.

• Distinctive features: dorsal crest, dewlap, long tail, strong claws.
• Habitat: riparian forests, mangroves, urban parks and gardens.
• Human notes: common pet, source of invasive populations in some regions; management concerns include burrowing and agricultural damage.
• Further reading: distribution maps and species accounts can be found via regional resources: species overview, Central America, South America, Caribbean.

For identification, natural history and care information consult reputable field guides and conservation organizations rather than anecdotal sources; taxonomic and range details are continually refined by ongoing research and regional surveys. Additional authoritative resources are available at pages listed here: arboreal adaptations, herbivory in reptiles, species notes, and other specialist references: genus overview, Iguana taxonomy.