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
Three-banded plover Three-banded plover The three-banded plover, or three-banded sandplover ("Charadrius tricollaris"), is a small wader. This plover is resident in much of eastern and southern Africa and Madagascar, mainly on inland rivers, pools, and lakes. Its nest is a bare scrape on shingle. This species is often seen as single individuals, but it will form small flocks. It hunts by sight for insects, worms and other invertebrates. Three-banded plovers have a sharp whistled "weeet-weet" call. The adult three-banded plover is 18 cm in length. It has long wings and a long tail, and therefore looks different from most other small plovers