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
HMS Plover (M26) HMS Plover (M26) HMS "Plover" was a coastal minelayer built for the Royal Navy in the mid-1930s. She laid over 15,000 mines during World War II and remained on active duty until she was sold for scrap in 1969. "Plover" displaced at standard load and at deep load. The ship had an overall length of , a beam of and a draught of . She was powered by two vertical triple-expansion steam engines, driving two shafts, which developed a total of and gave a maximum speed of . Steam for the engines was provided by two water-tube boilers. "Plover" carried