A documentary film about crocodiles on the Katum river
Crocodile - description
Crocodiles are a very old order of reptiles, including crocodiles, alligators (including Cayman) and gavials, a total of about 23 of recent species in 9 genera. It is (besides birds) the only living group from the group of archosauria, which included dinosaurs. It is a predator that excites both people and animals. These are the closest living relatives of birds, with whom the Archosaucians form together.
The largest species of crocodile species is crocodile marine. The largest well-documented individual reached about 6,3 meter and weight over 1200 kg. However, there are unverified reports of individuals long to about 9 meters weighing over 2 tons. Just a little smaller is the African Nile Crocodile On the contrary, the smallest is a crocodile frontal, which reaches the length of the 1,5 meter
The crocodiles are well adapted to the movement in the water, the tail drives the entire body forward and the limbs hold on to the body. They can swim at 10 km / h. Movements on land are less adapted and are relatively slow on land, and can run at a maximum speed of 12-14 km / h for a short distance. When moving, the legs have more body than other reptiles, their movement on land is more like mammalian movements than other reptiles.
The skin is very tough, firm and cramped, consisting of osteoderms, which form the "armor" all over the body and most of them are on the back and neck.
Previously it was thought that the crocodiles breathe like mammals, but studies from 2010 and 2013 showed that they breathe like birds. Upon inhalation air passes through the bronchus into the trachea, then divides into several smaller airways.
Usually underwater for one breath 15 minutes, but some species (especially larger individuals) can hold breath for up to two hours. It is not known exactly how deep they are able to sink, but it is certain that they are at least twenty meters long.
They are able to withstand several months without food. Larger species are able to catch large mammals, such as zebra and, exceptionally, young or diseased hippopotamus, while smaller species feed on fish in particular. Terrestrial animals hunt from a deposit hidden in the water, the animal pulls under the water and drowns. Young people feed on insects, molluscs and amphibians. Crocodiles are incapable of chewing, so smaller prey swallows and tears more. Sometimes she carries her carrots and very rarely consume fruits, thereby expanding the seeds. Cayman is also able to fish on land. Nile crocodiles occasionally collaborate on hunting, especially when tearing the prey.
The crocodiles begin to communicate before they hatch. After hatching, the mother calls and their calls are recognized by other adults. Adults give specific sounds to alert young people to the dangers or the presence of food. The loudest American American alligators, sneering and siren, are also intimidating enemies and potential young and egg predators. Vibrations also use intimidation. They also use the tail to slap, rub and swim with it.
Crocodiles live up to 80 years. They grow for life, and the biggest ones are the oldest. The age is determined by bones in bones. Growth of youngsters depends on the intake of food, and the attainment of sexual maturity is related to size rather than age. Female Crocodile Sea pups reach sexual maturity when they reach 2,2-2,5 meter and males at three meters.