The deadly snakes of Sarteneja include the large (6 foot) tommygof (Fer de lance, Cascobel; scientific name), and the Meso American (middle American) rattlesnake (scientific name) with a distinctive rattle in its tail.

Both these snakes have a brown and black diamond pattern that looks like dead leaves or grass. The tommygof can be aggressive and is very dangerous and rattlesnakes can generally be heard because of their rattle and are not generally aggressive.

Coral snakes found in the Sartenejan Region are very dangerous as they are small (2 foot) and generally hide under leaves and other litter making them difficult to see. 

Many people when bitten think that the bite is harmless, because of the small size of the coral snake, its small fangs, and no immediate effect of the venom. The deadly effects of the bite are not felt for about 2 hours and by then it is often too late for effective treatment.

The one species of coral snake in the Sartenejan Region only feeds on other snakes, including its own kind, and is very deadly and best avoided.

Coral snakes are interesting because many harmless snakes mimic the bright colours of coral snakes (red, yellow, and black). This mimicry gives the harmless snake protection from predators. One of the brightest of these snakes, the non-venomous milk snake (scientific name), is a predator of other snakes. 

Mimicry to give protection is called Bayesian Mimicry after the biologist that first described it. Butterflies were found to mimic the shape and colour of other butterflies that are bad tasting to gain protection from birds and other predators. These butterflies are also found in the Sartenejan Region.

There may be one other poisonous snake, the cantil (ref) in the Sartenejan Region. The cantil is found throughout the Yucatan and south to Guatemala in dry forest such as that around Sarteneja.

Coral snake
Extremely venomous and have short hollow fangs relatively fixed in a vertical position. Even small coral snakes are capable of delivering a bite to any part of the human body, but most commonly the hands, feet and ankles. Because there are no symptoms for hour’s people often disregard te bite. Alarming symptoms may develop hours after the bite including nausea, vomiting, convulsions, and drowsiness. The venom in general acts on the nervous system including paralysis of various nerves including those associated with the head resulting in difficulty in swallowing, twitching of the tongue, and pin-point pupils. In the case of fatal envenomation death is usually caused by respiratory and cardiac failure.
Barba Anmarilla (Bothrops asper) Fer-de-lance
Most feared snake in the region. When irritated the snake coils in readiness to strike and vibrates its tail. Are active at night. They have long, hollow fangs that are erected at the time of the bite. Viper bites have a frightening array of symptoms including localized pain, swelling, bleeding at the site of the bite, gums, nose, and urinary tract, drooping eyelids, difficulty in moving the eyes, vomiting, severe headaches, difficulty in breathing, kidney damage, abnormal blood clotting, hypotension, brachcardia, arrhythmia, and finally circulatory collapse.
In Guatemala there is a widespread belief that medicine from rattlesnakes cures cancer. The dressed rattlesnake is dried and ground into powder, bones and all.
Crocodile attacks. Morlet’s crocodile has attacked and killed several people in Belize and the Yucatan. In 1930 a young Belizean girl was injured by a crocodile when swimming in Laguna Perdida, and in 1955