Trinidad's two types of Caiman

Spectacled caiman (with eye shine) from the Caroni Swamp. Photo by Renoir Auguste

Trinidad and Tobago has two species of caimans. The spectacled caiman (Caiman crocodilus). and the Cuvier's dwarf caiman (Paleosuchus palpebrosus). The following are some traits about each type of caiman and how to tell them apart.

Spectacled caiman

• Typically grows to up to 2.3 m long. 
• Males are larger than females. 
• This species is widely distributed across the region, from Central America, to South America, and Trinidad and Tobago. 
• They typically reside in brackish and freshwater environments and can be easily seen at night in swamps with their eye shine. 
• Juveniles feed on aquatic invertebrates whereas adults feed on vertebrates such as fish, amphibians, birds, reptiles, and mammals. 
• Juveniles do have a distress call and parental care is noted in crocodilians.
• One of the key distinguishing features to tell the spectacled caiman apart from other caiman in the country is the bony ridge on the head behind the eyes.

Dwarf caiman

• Typically grows to about 1.5 m long.
• Males are slightly larger than females.
• Distribution range is South American.
• Habitat preference is for fast flowing streams in forests in cooler areas, compared to more open areas used by spectacled caimans.
• Juveniles feed on insects, fish, frogs, whereas adults also feed on these but would include mammals to their diet.
• Dwarf caimans are social and dominant individuals would have access to mates, food, nest sites.
• Upper and lower jaw has dark and light spots. Also, the lack of a bony ridge anterior to the eyes distinguishes it from the spectacled caiman.

Dwarf caiman. Source: Wikipedia.

Source of information:

• A field guide to the amphibians and reptiles of Trinidad and Tobago. Published by the Trinidad and Tobago Field Naturalists' Club. 
• Ali SH, Rampersad-Ali N, Murphy JC. 2016. The discovery of Cuvier’s Dwarf Caiman, Paleosuchus palpebrosus (Reptilia: Alligatoridae) in Trinidad. Living World, Journal of the Trinidad and Tobago Field Naturalists' Club. 2016 Nov 30.