Green Iguana

Overview

The green iguana (Iguana iguana) is the largest lizard in the Tortuguero canopy — adults run 1.2–1.7 m from snout to tail tip, with exceptional individuals exceeding 2 m. Despite the name, coloration varies considerably: Costa Rican iguanas often trend orange-red, especially adult males during the breeding season. All adults share the diagnostic features: prominent dorsal spines, a well-developed throat dewlap, and a row of subtympanic scales (large scales on the cheek below the ear).

Adult green iguanas are strictly herbivorous in the wild, browsing leaves, flowers, and fruit from over 100 plant species. They are primarily arboreal and diurnal, spending most of their time high in the canopy where they can thermoregulate in sun patches. They are excellent swimmers and routinely drop from overhanging branches into the water to escape predators.

Why Tortuguero

The Tortuguero canal system is ideal iguana habitat — tall riparian trees over water allow the drop-and-swim escape strategy that iguanas rely on. The park’s intact canopy provides both foraging sites and the thermal gradient iguanas require for digestion. Adults are most visible along the main canal where trees overhang open water.

Iguanas are also culturally important in the region: historically harvested for meat (locally called “gallina de palo” — stick chicken), they remain a food source in some rural communities, though they are protected within the park.

How to see them (honestly)

• Scan the high branches and thick horizontal limbs overhanging the canal — adult iguanas often bask motionless and can be hard to spot until they move.
• Bright orange-red males are conspicuous from January through April. A male displaying his dewlap from a canopy branch is one of the signature sights of a Tortuguero boat tour.
• Juveniles are bright green and easier to see in lower shrubs and palm fronds near the waterline.
• The splash of a large iguana dropping from a branch 8–10 m above the canal is often heard before it is seen.

Status note

Iguana iguana is Least Concern globally. Populations are stable across most of its range, though hunting pressure for the meat trade has reduced numbers in parts of Central America. Within Tortuguero the iguana population is unmanaged and visible. The species’ biggest conservation story is not in its native range but in Florida and the Caribbean, where introduced populations have become significant invasive pests — a reminder that “Least Concern” is range-specific.