Stock photography, photos: Casarcas at risk Stock photos of Casarcas passing resting crocodiles. Photograph: © Dick J.C. Klees Click for a larger image and more information Keywords associated with this stock photo: Crocodylus niloticus, Nile crocodile, Crocodile, reptile, Africa, Safari, river, bank, sun, sunbathing, casarca, duck, danger, risk, march, passing,