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
Forbes's plover Forbes's plover The Forbes’s plover or Forbes’s banded plover ("Charadrius forbesi") is a small wader. This plover is resident in much of west Africa, mainly on inland rivers, pools and lakes. Its nest is a scrape lined with small pebbles in rocky uplands. After breeding in the wet season, this bird moves to open grasslands, including airfields and golf courses, in the dry season. It is sometimes seen at pools or reservoirs. The adult Forbes’ plover is 20 cm in length. It has long wings and a long tail, and therefore looks different from most other small plovers in flight,