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
Wilson's plover Wilson's plover The Wilson's plover ("Charadrius wilsonia") is a small plover. Wilson's plover is a coastal wader which breeds on both coasts of the Americas from the equator northwards. Its range extends north to include much of the U.S. eastern seaboard, and the Pacific coast of Mexico on the west. It is a partial migrant. Birds leave the United States, except Florida, to winter south in Brazil. Some Mexican birds leave in winter for Peru. Furthermore, a small resident population is known from Brazil, it being named as a new subspecies, "brasiliensis", in 2008. In 2012 it was established that