Broad-snouted caiman

In the wild, adults normally grow to 2 to 2.5 m (6 ft 7 in to 8 ft 2 in) in length, but a few old males have been recorded to reach up to 3.5 m (11 ft).[5][7] Captive adults were found to have weighed 23 to 65 kg (51 to 143 lb).[8][9] A large adult male of 2.6 m (8 ft 6 in) would weigh around 80 kg (180 lb).[10] Most tend to be of a light olive-green color. A few individuals have spots on their faces.[6] The most notable physical characteristic is the broad snout from which its name is derived.[6] Borteiro et al 2009[11] studied the food habits of C. latirostris.[12] The snout is well adapted to rip through the dense vegetation of the marshes. Due to this, they swallow some of the dense vegetation while foraging for food.[11]

Caiman latirostris skeleton

Broad-snouted caiman (Caiman latirostris) on the border of pond in Bonito, Mato Grosso do Sul, Brazil

The broad-snouted caiman is ectothermic, it depends on its external environment to regulate its body temperature. A recent study on the heart rate's contribution to the regulation of the caimans' body temperature showed an increase in heart rate as the temperature increased, and it lowers once the temperature lowered.[13] Borteiro et al 2008 study young caimans' behaviour and find they rely heavily on their ability to find shelter to avoid predation.[12] They find this behaviour quickly drops off as they age.[12] The heat of the sun is absorbed through the skin into the blood, keeping its body temperature up. An increased heart rate helps the newly absorbed heat transfer throughout the body more quickly. When the air becomes cooler, the need for the heart rate to remain at an increased rate is lost.[13]

Reproduction

Broad-Snouted Caiman Babies

The female lays 18 to 50 eggs at a time. While rare, up to 129 eggs have been found within a single nest, presumably from several layings.[5] They lay their eggs in two layers, with a slight temperature difference between the two layers. This will result in a more even ratio of males and females.[6] The caiman does not have sex chromosomes, but instead depends on temperature to determine the ratio of male and female offspring. Eggs at warmer temperatures (32 °C (90 °F) or higher) develop into males and eggs at cooler temperatures (31 °C (88 °F) or lower) develop into females.[18] There are more important factors that contribute to the sex determination of the eggs. Estrogen levels and stress levels of the mother can have an effect. There was a study conducted that concluded that every nest was different in sex although they contained the same temperature. This indicated there are other factor that contribute to a nest having all male or females eggs.[19]

Hunting of the species began in the 1940s. Its skin is greatly valued for its smooth texture. Until most countries have made hunting them illegal, this was the largest threat to the broad-snouted caiman. This helped them to regain their population.[5] The new threat is habitat destruction.[5] Deforestation and pollution run-off are the two leading causes to the destruction of their habitat.[6]

It is a very well-known species in the lagoons of the urban areas of Barra da Tijuca and Recreio dos Bandeirantes, in Rio de Janeiro.1990 – Endangered (E) 1988 – Endangered (E) 1986 – Endangered (E) 1982 – Endangered (E)

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