Nile crocodile stability and additional weight to sink in water, this bearing great probability over the theories that they assist in digestion and staving off hunger. However, Alderton (1998) stated that a study using radiology found that gastroliths were seen to internally aid the grinding of food during digestion for a small Nile crocodile. Herodotus claimed that Nile crocodiles have a symbiotic relationship with certain birds, such as the Egyptian plover ("Pluvianus aegyptius"), which enter the crocodile's mouth and pick leeches feeding on the crocodile's blood, but no evidence of this interaction actually occurring in any crocodile species has been found, and
Kittlitz's plover The Malagasy population might result from a relatively recent immigration from mainland Africa, whereas the Madagascar plover ("Charadrius thoracius") might have evolved from an earlier Kittlitz’s plover population. The two species are clearly distinct and can not interbreed. Birds from Madagascar are in general smaller than birds from continental Africa. Kittlitz’s plovers are heavier and have longer wings in South Africa compared to Madagascar, whereas Egyptian specimens have longer wings and shorter tarsi than in Madagascar. However, they are still regarded as the same species in the absence of apparent plumage difference. In Madagascar, Kittlitz’s plover is both a breeding