From my forthcoming book:
The crocodile is an appropriate mother deity not only for her position as apex predator (and thus ruler) of the Nile, but for her maternal instincts. Crocodiles are more like their bird cousins than other reptiles in taking responsibility for their young. Mothers do not feed while they are nesting, and they guard their eggs continually except for brief periods when temperatures rise so high that they must enter the water to cool off. Nile crocodiles prefer colonial nesting, although predation by humans discourages this behavior. Eggs are buried in sand, and babies squeak as they are hatching. As soon as the mother hears the squeaks, she uncovers the eggs and carries the babies in her mouth to the water. During their first months of life, juveniles seek out and receive protection from adults, usually but not necessarily the mother.