nile crocodile or crocodylus niloticus with open mouth lies next to river

africa african aggressive alligator amphibian animal aquatic asleep big bite carnivore creature croc crocodile crocodylus crocodylusniloticus danger dangerous deadly dinosaur dozing exotic fauna grass green head horizontal hunter image jaws large leather madagascar many nature nile niloticus outdoor outdoors powerful predator reptile river sleeping swamp teeth water wild wildlife zoo