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 Kittlitz's plover Kittlitz’s plover ("Charadrius pecuarius") is a small shorebird (35-40 g) in the family Charadriidae that breeds near coastal and inland saltmarshes, sandy or muddy riverbanks or alkaline grasslands with short vegetation. It is native to much of Sub-Saharan Africa, the Nile Delta and Madagascar. It is thought to be mainly monogamous and has monomorphic plumage. Kittlitz’s plover is a small shorebird weighing between 35-40 grams. Both male and female have a black bill, dark brown eyes with black eyelids and black legs, although sometimes the legs can appear greenish or grey. During the breeding season, the male has