Lions at Ngorongoro Crater - Big cats tend to run off at the sight of humans or, if they have just eaten, do nothing. Full grown cats have no enemies. They only attack each other s young to lessen competition for food. Climbing trees is a good way to escape a lion unless you have the misfortune to encounter and antagonize a tree-climbing lion. Luckily they quite rare.
Lions typically kill and feed once every four days.
Because they have the best camouflage. Since most predators can only see monochrome, it is very difficult for them to distinguish an individual zebra in the middle of a herd. I guess one could say the same thing about a pin stripe suit and wingtip shoes. Elephants at Masai Mara - When an elephant dies, the other members of the herd remain in the area while the body of the deceased rots. Or so it used to be.