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
Semipalmated plover the difficulty in identifying them from the very similar ringed plover of Eurasia, of which it was formerly considered a subspecies. Semipalmated plovers forage for food on beaches, tidal flats and fields, usually by sight. They eat insects, crustaceans and worms. This bird resembles the killdeer but is much smaller and has only one band. Since the semipalmated plover nests on the ground, it uses a "broken-wing" display to lure intruders away from the nest, in a display similar to the related killdeer. Semipalmated plover The semipalmated plover ("Charadrius semipalmatus") is a small plover. The genus name "Charadrius" is a