After Nile crocodiles reach , the significance of most invertebrates in the diet decreases precipitously. An exception to this is in Uganda and Zambia, where subadults and adults of even large sizes, up to , may eat very large numbers of snails. Nearly 70% of the crocodiles examined by Cott (1961) had some remains of snails inside their stomachs. Predation on amuplariid water snails was especially heavy in Bangweulu Swamp, Lake Mweru Wantipa, and the Kafue Flats, where mollusks representing 89.1, 87, and 84.7% of all prey in these locations, respectively. Gastropoda (4126 records per Cott) were taken much more than Lamellibranchiata (six records). Notable favorites include "Pila ovata", which lives just under water on rocky surfaces (mainly found in crocodiles from Uganda) and "Lanistes ovum", which is found submerged among water plants and on detritus (mainly from stomachs in Zambia).