How big and heavy is an American crocodile in Sierpe?

Adult males in the Térraba-Sierpe wetland typically reach 11.5 to 15 feet (3.5 to 4.5 m) in length and weigh 660 to 1,100 lbs (300 to 500 kg). Record individuals exceed 16 feet and 1,300 lbs.

How do you distinguish a crocodile from a caiman?

Crocodiles have narrow, tapered V-shaped snouts and their 4th lower tooth remains visible when jaws are closed. Caimans are much smaller (up to 7.5 ft), have broad rounded U-shaped snouts, and hide lower teeth upon jaw closure.

Why do crocodiles bask with their mouths open?

As ectothermic reptiles, crocodiles cannot sweat. Basking with open jaws allows cooling airflow across oral blood vessels, regulating internal core temperature under tropical sun.

Is the Sierpe mangrove boat tour safe around crocodiles?

100% safe. Tour boats are spacious, motorized crafts with high protective gunwales. Crocodiles view passing boats with calm indifference and never jump or display aggression toward vessels.

The American Crocodile in Sierpe: Size, Weight, 3,700 psi Bite & Mangrove Habits

The Térraba-Sierpe National Wetland, encompassing over 66,000 acres of protected mangrove channels, serves as the primary sanctuary for Costa Rica's apex aquatic predator: the American crocodile (Crocodylus acutus). Having survived virtually unchanged since the Cretaceous era, this massive prehistoric reptile thrives in the nutrient-dense brackish waters of the Sierpe delta.

📋 Quick Species Profile: American Crocodile

Scientific Name: Crocodylus acutus

Male Length: 11.5 to 15.5 feet (3.5 to 4.8 m, records > 17 ft)

Female Length: 8.2 to 11.5 feet (2.5 to 3.5 m)

Adult Weight: 660 to 1,200 lbs (300 to 550 kg)

Bite Pressure: Exceeds 3,700 psi (crushes bone and turtle shells)

Salt Tolerance: Modified lingual salt glands allow ocean travel

Sensory System: Integumentary sensory organs (ISOs) detect aquatic vibrations

Thermoregulation: Mouth-gaping on sunny mudbanks

Sighting Probability: Very high on Sierpe River low-tide boat safaris

Size, Armored Armor & 3,700 psi Bite Force

The American crocodile is among the largest living crocodilians. Mature river bulls stretch past 14 feet and tip scales over 1,000 pounds. Equipped with 66 interlocking conical teeth that regenerate continuously throughout life, their jaws snap with over 3,700 psi of crushing force — outmatching lions and white sharks.

Salt Glands: Mastering Mangroves and Open Ocean

Unlike strictly freshwater caimans, crocodiles feature lingual salt glands beneath their tongue. By expelling concentrated salt from bloodstream, crocodiles easily navigate saline mangrove mouths, surf river mouths, and cross open ocean channels toward islands like Caño Island.

You Could Spot It on the Sierpe Mangrove Tour ($66 USD)

* Crocodiles sunbathe naturally along mudbanks during low tides on the Sierpe River.