Nile crocodile stability and additional weight to sink in water, this bearing great probability over the theories that they assist in digestion and staving off hunger. However, Alderton (1998) stated that a study using radiology found that gastroliths were seen to internally aid the grinding of food during digestion for a small Nile crocodile. Herodotus claimed that Nile crocodiles have a symbiotic relationship with certain birds, such as the Egyptian plover ("Pluvianus aegyptius"), which enter the crocodile's mouth and pick leeches feeding on the crocodile's blood, but no evidence of this interaction actually occurring in any crocodile species has been found, and
Collared plover a complete breastband. semipalmated plovers are larger, thicker-billed, and has a pale collar. Ironically, it is the "lack" of a pale collar which gives the collared plover its English language and scientific names. The collared plover is found on sandy coasts, estuarine mud, inland riverbanks and open sandy savannas. It breeds from Mexico south through Central America and most of South America. It also occurs on some of the southern Caribbean islands, and both Trinidad and Tobago. It appears to be mainly sedentary, although there is some evidence for limited seasonal movements. Collared plovers feed on insects and other invertebrates,