The Hippo is a placid and inoffensive animal when left alone, but if provoked can be extremely dangerous. Solitary bulls and cows with calves can quickly become aggressive and there are many reports of small boats being overturned and the occupants bitten to death. Hippos demonstrate aggression by opening the mouth, displaying the imposing teeth and by making short charges through the water. Such charges are sometimes directed at intruders who venture too close to the edge of the water. When a grazing Hippo is disturbed, it is dangerous to be between it and the water, as it will blindly run alongs its path, trampling anything in its way. When confronted by a charging Hippo the best one can do is to dive out of the way. Avoid thickets near water and take note of their characteristic paths. Do not camp at or near Hippo paths or waterholes, since Hippos are attracted to fires and lights. During droughts when Hippo are concentrated in small waterholes, they feel threatened in the shallow water and may charge out.