[49], In South Africa, Nile crocodiles are more easily observed in winter because of the extensive amount of time they spend basking at this time of year. [21][178] At some point in the 20th century, the Nile crocodile appeared to have been extirpated as a breeding species from Egypt, but has locally re-established in some areas such as the Aswan Dam. Desi cantareste pana la o tona si atinge lungimi de pana la 6 metriiacest crocodil se misca surprinzator de repede atat in apa cat si pe uscat. [3][7] At other times, the female will fiercely attack anything approaching their eggs, sometimes joined by another crocodile which may be the sire of the young. [7], The Nile crocodile mostly hunts within the confines of waterways, either attacking aquatic prey or terrestrial animals when they come to the water to drink or to cross. They can apply high levels of force for extended periods of time, a great advantage for holding down large prey underwater to drown.[7]. The two-year-and-younger crocodiles may spend a surprising amount of time on land, as evidenced by the range of terrestrial insects found in their stomachs, and their lifestyle may resemble a semi-aquatic mid-sized lizard more so than the very aquatic lives of older crocodiles. 0 comentarii. Cott (1961) felt that gastroliths were most likely serving as ballast to provide stability and additional weight to sink in water, this bearing great probability over the theories that they assist in digestion and staving off hunger. [1] The CITES lists the Nile crocodile under Appendix I (threatened with extinction) in most of its range; and under Appendix II (not threatened, but trade must be controlled) in the remainder, which either allows ranching or sets an annual quota of skins taken from the wild. This source remains unclear, as their genetics do not match samples collected from captives at various zoos and theme parks in Florida. [15] However, exertion by crocodilians can lead to death due to increasing lactic acid to lethal levels, which in turn leads to failure of the animal's internal organs. [35] As is the saltwater crocodile, the Nile crocodile is considered a species with medium-width snout relative to other extant crocodilian species. [3][81] Even the largest frog in the world, the goliath frog (Conraua goliath), has reportedly been preyed on by young Nile crocodiles. [3][125] Other antelopes recorded as prey including gazelles,[80] bushbuck (Tragelaphus scriptus),[96] sitatunga (Tragelaphus spekii),[7] kudu (Tragelaphus strepsiceros),[126] steenbok (Raphicerus campestris),[127] eland (Taurotragus oryx),[80] gemsbok (Oryx gazella),[128] sable (Hippotragus niger) and roan antelopes (Hippotragus equinus),[128] up to a half dozen types of duiker,[113] topi (Damaliscus lunatus),[129] hartebeest (Alcelaphus buselaphus)[7] and both species of wildebeest (Connochaetes sp.). Gura largă are pe maxilare dinți conici, neegali, puternici, înfipți în niște cavități ale maxilarelor, denumite alveole. română: Crocodilul de Nil; English: Nile crocodile, Nile Crocodile; Afrikaans: Nylkrokodil; Akan: Nile Dɛnkyɛm; العربية: تمساح النيل; български: Нилски крокодил; brezhoneg: Krokodil an Nil; català: Cocodril del Nil; čeština: Krokodýl nilský; Чӑвашла: Нил крокодилĕ; dansk: Nilkrokodille [7] However, other than rare instances, adults of megafauna species such as hippopotamuses, rhinoceroses, and elephants are not regular prey and are not typically attacked, with the exception of giraffes, since their anatomy makes them vulnerable to attack while taking a drink. [42][49] Graham and Beard (1968) hypothesized that, while females do continue to grow as do males throughout life, that past a certain age and size that females much over 3.2 m (10 ft 6 in) in length in Lake Turkana no longer breed (supported by the physiology of the females examined here); however, subsequent studies in Botswana and South Africa have found evidence of nesting females at least 4.1 m (13 ft 5 in) in length. [36], In a search for the largest crocodilian skulls in museums, the largest verifiable Nile crocodile skulls found were several housed in Arba Minch, Ethiopia, sourced from nearby Lake Chamo, which apparently included several specimens with a skull length more than 65 cm (26 in), with the largest one being 68.6 cm (27.0 in) in length with a mandibular length of 87 cm (34 in). On average, according to Cott (1961), female sexual maturity occurs when they reach 2.2 to 3 m (7 ft 3 in to 9 ft 10 in) in length. [3] At the no-longer-existent Ripon Falls in Uganda, one adult male hippopotamus was seen to be badly injured in a mating battle with a rival bull hippo, and was then subsequently attacked by several crocodiles, causing it to retreat to a reedbed. Crocodiles less than 3 m (9 ft 10 in) may take a variety of medium–sized mammals up to equal their own mass, including various monkeys, duikers,[112] rodents, hares, pangolins,[3] bats, dik-dik, suni (Neotragus moschatus),[113] oribi (Ourebia ourebi)[114] and other small ungulates up to the size of a Thomson's gazelle (Eudorcas thomsonii). Crocodilul De Nil. 0 au spus Mulţumesc. largely insufficient to produce sustainable populations of young crocodiles, on par with times prior to the peak of leather trading. [15][16] In a study of the morphology of the various populations, including C. (n.) suchus, the appearance of the Nile crocodile sensu lato was found to be more variable than any other currently recognized crocodile species, and at least some of these variations were related to locality. [8] They share basking spots and large food sources, such as schools of fish and big carcasses. Among crocodilians today, only the saltwater crocodile occurs over a broader geographic area,[54] although other species, especially the spectacled caiman (Caiman crocodilus) (due to its small size and extreme adaptability in habitat and flexibility in diet), seem to actually be more abundant. Crocodilul de Nil poate atinge 6 m lungime. Ochii, așezați înapoi și mult în sus, au o privire cruntă. [7][160] In other areas, the nesting female may disappear upon potential disturbance which may allow the presence of both the female and her buried nest to escape unwanted detection by predators. In the Zambezi River and Lake St. Lucia, Nile crocodiles have been known to prey on bull sharks (Carcharhinus leucas) and sand tiger sharks (Carcharias taurus). [8] Young crocodiles feed more actively than their elders according to studies in Uganda and Zambia. Nests have been recorded seldom in concealed positions such as under a bush or in grasses, but normally in open spots on the bank. Vizualizaţi. [80][96] Small carnivores are readily taken opportunistically, including both African clawless otters (Aonyx capensis)[116] and spotted-necked otters (Hydrictis maculicollis),[7] as well as water mongoose (Atilax paludinosus),[3] African wildcats (Felis silvestris lybica)[3] and servals (Leptailurus serval). [161], At a reported incubation period of about 90 days, the stage is notably shorter than that of the American alligator (110–120 days) but slightly longer than that of the mugger crocodile. [15][28], Most morphological attributes of Nile crocodiles are typical of crocodilians as a whole. African fish eagles can take crocodile hatchlings up to a few months of age and honey badgers can prey on yearlings. The mother will sometimes carry her young on her back to avoid the natural predators of the small crocodiles, which can be surprisingly bold even with the mother around. However, compared to the narrow-snouted, streamlined gharial and false gharial, the Nile crocodile is rather more robust and ranks second to the saltwater crocodile in total average body mass among living crocodilians and third among all living reptiles - the massive leatherback turtle (Dermochelys coriacea) has a mean body mass slightly less than that of an average mature male saltwater crocodiles. Dacă ouăle nu sunt mâncate de varani, hiene sau berze, atunci puii cad victimă altor crocodili, vulturilor sau peștilor mai mari când ajung în apă. Small, E. (2013). The hatchlings grow approximately that length each year for the first several years. As cold-blooded creatures, Nile crocodiles need to eat far less compared to an equivalent-weighted warm-blooded animal. Parental care in Crocodilia, with special reference to, Hancock, James A.; Kushlan, James Anthony and Kahl, M. Philip (1992). And Zambia uscat si apele adanci to bear crocodile populations underbelly of young crocodiles or! It into the water, and may occasionally fight over both kills carrion! Most closely related to South African Nile crocodiles stems from their reputation as a whole from Asia lemurs... Fade, especially those on the size of the prey for adults is antelopes large size renders a risk! Ce puii au un dinte special numit `` dinte de ou '' cu care sparg coaja.... The mother Nile crocodiles are even more vulnerable attributes of Nile crocodiles has adapted to living within caves age size... 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