AnimaliaHighest rank in taxonomy. Groups all life into domains: Animalia, Plantae, Fungi, etc.IUCN VUInternational Union for Conservation of Nature — the world authority on species extinction risk, using standardized criteria. — Vulnerable — at high risk of extinction if the current adverse conditions continue.In ProgressCurrent stage of this record in the editorial review workflow. Recent Sighting
Crocodylus acutus
American Crocodile
Cuvier, 1807
Detailed Texts Multi-lang
The American crocodile (Crocodylus acutus) is the largest reptile species in the Neotropical region and one of the most formidable apex predators in the Americas. It features a distinctive 'V'-shaped snout, narrower than that of caimans and alligators, but broader than a gharial's. Its coloration ranges from grayish-green to olive-brown in adults, while juveniles are lighter with dark transverse banding on the tail and back. Unlike the spectacled caimans (Caiman crocodilus) with which it shares habitats in Costa Rica, the American crocodile exposes the fourth tooth of the lower jaw when its mouth is closed. Its body is heavily armored with bony plates (osteoderms) that provide protection. It has short but highly muscular legs and an exceptionally powerful tail that propels its swimming. Its distribution is wide, ranging from southern Florida, the coasts of Mexico, Central America, the Caribbean islands, to northern South America. In Costa Rica, it is notable for exceptionally dense and visible populations in the Tárcoles and Tempisque river basins.
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TaxonomyBiological classification ranks placing this species within the tree of life, from Kingdom down to Genus.
PhylumRank below Kingdom. Groups organisms sharing a fundamental body plan (e.g., Chordata = vertebrates and some invertebrates).Chordata
ClassRank below Phylum. Subdivides by structural traits (e.g., Mammalia, Aves, Reptilia, Insecta).Reptilia
OrderRank below Class. Groups related families sharing common ancestry (e.g., Carnivora, Primates).Crocodilia
FamilyRank below Order. Groups closely related genera (e.g., Felidae = cats, Canidae = dogs).Crocodylidae
GenusRank just above Species. The first word in the two-part binomial scientific name.Crocodylus
Taxonomic AuthorityThe scientist who first formally described and published this species, followed by the year of publication.Cuvier, 1807
Record Completeness
94%Coming soon
Ecology & StatusHow this species lives: habitat preferences, diet, behavior, population status, and role in its ecosystem.
OriginWhether the species is native (evolved here), endemic (found only here), or introduced by human activity.
Native
Population TrendDirection of change in population size over time: increasing, stable, decreasing, or unknown.
Decreasing
Breeding SeasonTime of year when this species typically reproduces or flowers.
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Trophic RolePosition in the food chain: producer, herbivore, carnivore, omnivore, decomposer, or parasite.
Carnivore
Recent SightingsWhether this species has been observed in the wild in Costa Rica within recent years.
Yes
Habitat SummaryOverview of the specific ecosystems and environments where this species is found in Costa Rica. Multi-lang
It is a species highly adaptable to salinity, thriving in coastal ecosystems where freshwater mixes with the sea. Its primary habitats include mangrove swamps, estuaries, coastal lagoons, canals, river mouths, and beaches. However, it also travels kilometers inland up large river channels, establishing itself in slow-moving rivers, freshwater swamps, and reservoirs. They require sun-exposed sand or mudbanks for thermoregulation and nesting, and waters deep enough to hide and ambush prey. In Costa Rica, the Tárcoles River and Palo Verde National Park (Tempisque River) represent their most emblematic and highest-density habitats.BehaviourDaily activity patterns, movement, territory use, foraging style, and seasonal behavioral changes. Multi-lang
It is an ectothermic (cold-blooded) reptile whose daily activity is governed by ambient temperature. In the mornings and afternoons, it congregates on muddy banks to practice basking. They frequently exhibit a behavior called 'gaping' (mouth open), which facilitates cooling by thermal evaporation from the moist tissues of the mouth. At noon, during the peak heat, they retreat to deep water or the protective shade of the mangroves. Although they appear lethargic and clumsy on land, they are capable of alarming bursts of speed over short distances (up to 15 km/h). They are predominantly nocturnal hunters, floating motionless on the water's surface, exposing only their eyes and nostrils, waiting with infinite patience for prey to approach the water's edge to drink.Social ActivitySocial structure: whether the species is solitary, paired, or colonial; hierarchy and communication. Multi-lang
It is a hierarchical species. Although they congregate in large numbers to peacefully bask on riverbanks (even stacking on top of each other), access to the best thermal sites is dictated by size. Dominant males, usually the most massive, claim the best territories in deep water and react extremely aggressively towards rivals of similar size during the mating season, inflicting mutilating bites, roaring, and slapping their heads against the water. Younger and smaller individuals must keep their distance to avoid being cannibalized or killed due to territoriality.Feeding GuildWhat the species eats, how it forages or hunts, and its role as a consumer in the food web. Multi-lang
Carnivore (Ambush predator). Its entire anatomy is perfected to go unnoticed under murky water. They patiently wait for terrestrial birds or mammals to come down to drink, launching like a torpedo and gripping the victim with dozens of conical teeth designed to hold, not cut. After capture, they drown their prey. Since they cannot chew, they swallow food whole. For prey too large to fit in their throat, they utilize the infamous 'death roll': they grab a piece and violently spin on their longitudinal axis in the water to dismember or tear off chunks of meat.Trophic Chain DetailsSpecific interactions in local food webs: prey species, predators, competitors, and scavengers. Multi-lang
It is the absolute apex predator in the estuarine systems and rivers it inhabits. As hatchlings, their diet is dominated by insects, crustaceans, snails, and small amphibians. As juveniles, they integrate crabs, small fish, turtles, and waterfowl. Adults hunt almost any prey they can catch and swallow: large fish (like snook and mullet), iguanas, pelicans, raccoons, coatis, monkeys, feral dogs, calves, and, on rare occasions, adult cattle. They are essential to the ecosystem as they recycle nutrients, control mesopredator populations (like raccoons that would otherwise destroy sea turtle nests), and remove carrion from waterways. Only as hatchlings are they vulnerable to herons, ospreys, coatis, and large fish; a healthy adult has no natural predators other than humans and, infrequently, jaguars in certain protected areas.Reproductive BehaviourMating strategies, courtship displays, nesting or spawning behavior, and parental care. Multi-lang
The courtship season occurs in the dry season (February to May). Females construct nests by excavating deep holes in exposed sandy banks, where they deposit between 30 and 60 eggs. Unlike turtles and other reptiles that abandon their nests, mother crocodiles fiercely protect the area against any intruder during the ~85 days of incubation. Upon hatching, the babies emit high-pitched chirps from under the dirt. Hearing them, the mother unearths the sand and astonishingly transports the delicate hatchlings inside her colossal jaws to the water's edge for their first swim. Despite this initial maternal care, infant mortality is extreme: over 90% of hatchlings will succumb to predators before their first year of life.Physical Measures
Length (cm)
250.0 - 600.0 cm
Weight (Grams)
150.00 kg - 900.00 kg
Offspring per cycleTypical number of young (live births, eggs, or seeds) produced by one adult in a single reproductive event or breeding season.30 - 60
Sexual DimorphismObservable physical differences between males and females of the same species (e.g., size, coloration, features).Yes
Lifespan
Sexual MaturityAge at which the individual becomes capable of reproducing for the first time.
8 - 15 Years
Gestation / IncubationDuration from fertilization to birth (mammals) or to hatching (egg-laying species).
80 - 90
Lifespan EstimatedExpected duration of life from birth to natural death under wild conditions.
Males50 - 70 Years
Females50 - 70 Years
Sexual DimorphismPhysical differences in size, coloration, or morphology between males and females of this species.
Males Multi-lang
Adult males exhibit a monstrous size and a much broader, heavier, and more robust build than females. They reach extraordinary lengths, routinely growing up to 4.5 meters, and old or exceptional specimens have been recorded measuring between 5.5 and 6 meters long with a weight exceeding 800 kilograms. They also possess a noticeably more massive head and more prominent osteoderms along the back for defense during territorial combat with other giant males.
Females Multi-lang
Adult females are significantly smaller in length and overall body mass than dominant males. They rarely exceed 3 to 3.5 meters in length, and their overall weight ranges between 150 and 250 kilograms (vastly inferior to the titanic weights of males). Although their snout is lethal, anatomically it can appear more delicate and less broad at the cranial base. During the nesting season, they become extremely protective and undertake all the work of digging and caring for the nest without male assistance.
Evolutionary AdaptationsInherited traits and behaviors that improve the species' survival and reproduction in its specific environment. Multi-lang
Lingual salt glands: Unlike alligators, American crocodiles possess specialized glands under their tongue that excrete excess salt from their bloodstream. This crucial physiological adaptation allows them to survive for prolonged periods in marine environments, cross open sea channels, and colonize remote islands.
Integumentary Sensory Organs (ISOs): They have small, dark-colored pits or pores on the scales lining their upper and lower jaws. These mechanoreceptors are incredibly sensitive to the slightest changes in water pressure, allowing them to detect the movement of prey in total darkness or murky waters without using sight.
Palatal valve and nictitating membrane: They possess a flap of cartilaginous tissue at the back of the mouth (palatal valve) that seals the throat, allowing them to open their mouths and capture prey underwater without drowning. Additionally, a transparent membrane (nictitating membrane) covers their eyes when submerged, acting like protective diving goggles.
Specialized hemoglobin and extreme apnea: The design of their hemoglobin allows them to utilize almost 100% of the oxygen stored in their lungs and blood. They can drastically reduce their heart rate to a few beats per minute, allowing them to remain submerged for over an hour, and up to two hours if inactive.
Main ThreatsDocumented pressures reducing the population: habitat loss, hunting, disease, climate change, and invasive species. Multi-lang
Human-crocodile conflict (HCC): Urban and tourist expansion in coastal areas interferes with their natural habitat, generating incidents where they attack pets or, rarely, humans. This frequently results in retaliatory killings, stigmatization, and illegal hunting out of fear or the false belief that an 'overpopulation' exists.
Habitat destruction and channel alteration: The clearing of mangroves for aquaculture (shrimp farming), tourism, and real estate development eliminates critical rearing and refuge zones for juveniles. Additionally, chemical pollution from agricultural pesticides in large rivers (like the Tempisque) and the construction of dams alter the hydrological dynamics they need to reproduce.
Climate change and nesting temperature: As in all crocodilians, the sex of the hatchlings is determined by the incubation temperature in the nest (TSD). The global rise in temperatures causes an excessively skewed proportion of males to be born (higher temperatures produce males), threatening the balance and long-term viability of local populations.
Interesting FactsSurprising or notable facts that highlight what makes this species unique or ecologically important. Multi-lang
The Tárcoles River Bridge in Costa Rica's Central Pacific is internationally famous as the 'Crocodile Bridge'. Dozens of massive American crocodiles congregate under the bridge to bask in the sun, offering thousands of tourists a spectacular and unusual sighting of apex predators in an almost urban setting.
The myth of 'crocodile tears' has a scientific basis: crocodiles actually produce tears constantly to lubricate their eyes. By spending time out of the water with their mouths open, the air dries their eyes quickly, causing a thick tearing that runs down their face, giving the false psychological impression that they cry for the prey they consume.
They have the most powerful bite in the animal kingdom in proportion to their body, generated by massive masseter muscles. However, the muscles responsible for opening their jaws are incredibly weak. An adult human can hold a giant crocodile's mouth closed using only their bare hands or strong duct tape.