Does any one know if these two separate species of Crocodiles can successfully mate and, produce fertile offspring. Small species of reptiles are largely ignored as prey at this size.
This combined with the species’ large size renders a higher risk of attack.  A more contemporary study claimed the number of attacks by Nile crocodiles per year as 275 to 745, of which 63% are fatal, as opposed to an estimated 30 attacks per year by saltwater crocodiles, of which 50% are fatal.  At one time, the fossil species Rimasuchus lloydi was thought to be the ancestor of the Nile crocodile, but more recent research has indicated that Rimasuchus, despite its very large size (about 20–30% bigger than a Nile crocodile with a skull length estimated up to 97 cm (38 in)), is more closely related to the dwarf crocodile (Osteolaemus tetraspis) among living species.
They aren’t eating them, but cracking the shells.
, 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. If she wants to mate with him she will be vocal about it. They are agile predators and wait for the opportunity for a prey item to come well within attack range.  In yet another historic crocodile stronghold, the Olifants River, which flows through Kruger National Park, numerous crocodile deaths have been reported.
Crocodiles tend to respect this order; when it is infringed, the results are often violent and sometimes fatal.  The Nile crocodile is one of the most dangerous species of crocodile and is responsible for hundreds of human deaths every year.
Many "large waders" are virulent predators of crocodile hatchlings, from dainty little egrets (Egretta garzetta) and compact hamerkops (Scopus umbretta) to towering saddle-billed storks (Ephippiorhynchus senegalensis), goliath herons and shoebills (Balaeniceps rex). For crocodiles the mating season usually will begin in July or August.
Nile crocodiles are opportunistic apex predators; a very aggressive species of crocodile, they are capable of taking almost any animal within their range. Parental care in Crocodilia, with special reference to, Hancock, James A.; Kushlan, James Anthony and Kahl, M. Philip (1992). 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. He will try to rub his body against hers to see if she will return the affection or not.
All of this offers them plenty of ways to hide out there in their natural environment. Carcass size shapes the structure and functioning of an African scavenging assemblage.
 Primates of various sizes may be taken by subadult or adult crocodiles.  The only aspect of mortality in this age range that is well studied is predation and this is most likely the primary cause of death while the saurians are still diminutive. In general, at the smallest sizes (0.3–1 m (1 ft 0 in–3 ft 3 in)), Nile crocodiles were most likely to have full stomachs (17.4% full per Cott); adults at 3–4 m (9 ft 10 in–13 ft 1 in) in length were most likely to have empty stomachs (20.2%).  Crocodile teeth are not used for tearing up flesh, but to sink deep into it and hold on to the prey item.  Recovery for the species appears quite gradual and few areas have recovered to bear crocodile populations, i.e.
 The single most virulent predator of nests is almost certainly the Nile monitor.  Much prey taken is much smaller than the crocodile itself and such prey can be overpowered and swallowed with ease.
They can also become scavengers if they wish, or the situation warrants it.
These may include Grévy's (Equus grevyi) and plains zebras (Equus quagga), pygmy hippopotamus (Choeropsis liberiensis), warthogs (Phacochoerus africanus), bushpigs (Potamochoerus larvatus) and red river hogs (Potamochoerus porcus).  However, despite their robust skulls, alligators and caimans appear to be proportionately equal in biting force to true crocodiles, as the muscular tendons used to shut the jaws are similar in proportional size.  In one case, an adult crocodile charged from the water up a bank to kill a bushbuck (Tragelaphus scriptus) and instead of dragging it into the water, was observed to pull the kill further on land into the cover of the bush.
, Numerous birds, including storks, small wading birds, waterfowl, eagles, and even small, swift-flying birds, may be snatched.
While adults can and will consume nearly all types of prey consumed by the younger specimens, as adult crocodiles gain bulk, they lose much of the necessary maneuverability to capture agile prey such as fish and are not likely to meet their dietary needs by consuming small prey and may expel unnecessary amounts of energy, so take them secondarily to larger prey. and Clarias gariepinus, which are preyed upon quite regularly in areas where they are common.  In the Okavango Delta, the African pikes (Hepsetus spp.) Have you though of you as an animal?  Since crocodiles are solitary hunters, the Nile crocodile is the only predator in Africa known to attack full-grown buffaloes alone, compared to the preferred pride attack method of lions.. The Nile crocodile (Crocodylus niloticus) is a large crocodilian native to freshwater habitats in Africa, where it is present in 26 countries.  Nile crocodiles have temperature-dependent sex determination (TSD), which means the sex of their hatchlings is determined not by genetics as is the case in mammals and birds, but by the average temperature during the middle third of their incubation period.
 In Lake St. Lucia, highly saline water has been pumped into the already brackish waters due to irrigation practices.
 They have a rich vocal range, and good hearing. In fact, probably much of the food from crocodile stomachs may come from scavenging carrion, and the crocodiles could be viewed as performing a similar function at times as do vultures or hyenas on land. In crocodiles between these distributions egg-laying is in intermediate months, often focused between April and July.
 Although they can remain practically motionless for hours on end, whether basking or sitting in shallows, Nile crocodiles are said to be constantly aware of their surroundings and aware of the presence of other animals. There are also plenty of spots on it that are dark black in color.
 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. They will hide the entrance as well so that they can get back in there when they need to.  Females will not leave nest site even if rocks throw at her back and several authors note her trance-like state while standing near nest, similar to crocodiles in aestivation but not like any other stage in their life-cycle. More modestly sized fish are generally swallowed whole.
, The type and size of the prey depends mostly on the size of the crocodile.  Specimens shot near Mpondwe on the Semliki River had gastroliths in their stomach despite being shot miles away from any sources for stones, the same applies to the Kafue Flats, Upper Zambesi and Bangweulu Swamp, all of which often had stones inside them despite being nowhere near stony regions. Large reptiles, or armoured reptiles such as turtles, were almost negligible in crocodiles under 2.5 m (8 ft 2 in) and most common in the stomachs of crocodiles over 3.5 m (11 ft 6 in) in length from Uganda and Zambia.
One of the fish predators seriously affected by the unchecked mesopredator fish populations (due again to crocodile declines) is humans, particularly with respect to tilapia, an important commercial fish that has declined due to excessive predation.
, During the time from when they are roughly 1.5 to 2.2 m (4 ft 11 in to 7 ft 3 in) long (roughly 5 to 9 years old), Nile crocodiles seem to have the broadest diet of any age range. Like all crocodilians, for example, the Nile crocodile is a quadruped with four short, splayed legs, a long, powerful tail, a scaly hide with rows of ossified scutes running down its back and tail, and powerful, elongated jaws. Crocodiles in aestivation are totally lethargic, entering a state similar to animals that hibernate. , Larger fish, like catfish and freshwater bass, are preferred by adults more than 2.2 m (7 ft 3 in) in length.
 The Nile crocodile has fewer osteoderms on the belly, which are much more conspicuous on some of the more modestly sized crocodilians. The "Nile Crocodile" is native to Africa.
While she will do all she can to offer protection and direction her efforts are often in vain. , 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. Based on these findings, it has also been suggested that crocodiles may act as seed dispersers. When a male is ready to mate, he will very carefully and attentively approach a female.  Ospreys (Pandion haliaetus) are known to be grabbed while they dive for fish as are possibly African fish eagles (Haliaeetus vocifer), while crowned eagles (Stephanoaetus coronatus) have reportedly been ambushed on land at carrion. All others will be driven out of their location, forcefully if necessary.  Similarly, a wide range of studies from southern Africa found that the average length for females at the onset of sexual maturity was 2.33 m (7 ft 8 in). , Most biologists who have engaged in months or even years of field work with Nile crocodiles, including Cott (1961), Graham and Beard (1968) and Guggisberg (1972), have found that with sufficient precautions, their own lives and the lives of their local guides were rarely, if ever, at risk in areas with many crocodiles.  According to Cott (1961), the average length and weight of Nile crocodiles from Uganda and Zambia in breeding maturity was 3.16 m (10 ft 4 in) and 137.5 kg (303 lb). The females are going to make sure that other females aren’t coming into their area to find a place to put their nest.
They take more or less much the same small prey as smaller crocodiles, including insects and arachnids, but also take many small to medium-sized vertebrates and quickly become capable taking down prey up to their own weight.
 The diet of young crocodiles is made up largely of insects and other invertebrates, since this is the only prey the same animals can easily take. Likewise, it can be up to 100 days if the temperatures are cooler before they emerge. Incautious human behavior is the primary drive behind crocodile attacks. This is very different from the way in which a crocodile is often portrayed.
 The taking of commercially important fish, such as Tilapia, has been mentioned as a source of conflict between humans and crocodiles, and used as justification for crocodile-culling operations; however, even a primarily piscivorous crocodile needs relatively so little fish that it cannot deplete fish populations on its own without other (often anthropogenic) influences.
The arid land surrounding Lake Turkana is a relatively barren region for diverse or numerous prey other than fish, so fish are an exceptionally important food source to crocodiles there. , Among the mammals, the bulk of the prey for adults is antelopes.
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