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 Collared plover The collared plover ("Charadrius collaris") is a small shorebird in the plover family, Charadriidae. It lives along coasts and riverbanks of the tropical to temperate Americas, from central Mexico south to Chile and Argentina. This small plover is long and weighs . Its upperparts are brown and the underparts white in all plumages. Adults have a black breast band. The male has a white forehead, bordered above by a black frontal bar, and below by a black stripe from the bill to the eye. The midcrown and nape are chestnut and the legs are yellow. In flight, the