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
Collared plover flight feathers are dark with a white wing bar, and the tail shows white sides. The female collared plover is usually very similar to the male, but some individuals can be sexed by a brown tinge to the black areas. Immature birds lack any black on the head, and the breast band is replaced by brown patches on each side of the chest. The flight call is a sharp metallic "pip". Two sympatric "Charadrius" species are very similar: The snowy plover is similar in size and structure to this species, but is paler above, has dark legs, and never has