Crocodile bulks of swallowed prey flesh and bone. Many large crocodilians swallow stones (called gastroliths or stomach stones), which may act as ballast to balance their bodies or assist in crushing food, similar to grit ingested by birds. Herodotus claimed that Nile crocodiles had a symbiotic relationship with certain birds, such as the Egyptian plover, which enter the crocodile's mouth and pick leeches feeding on the crocodile's blood; with no evidence of this interaction actually occurring in any crocodile species, it is most likely mythical or allegorical fiction. Since they feed by grabbing and holding onto their prey, they have evolved
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