Kamunyak and an oryx
For those of you who do not know, an oryx is a type of deer-looking animal that can be found in Africa. It has horns and usually grazes the plains, eating grass and other things. One of its main predators is the lion, which makes this story so unbelievable in its nature.
After killing the mother of six oryx cubs, a lion named Kamunyak took all the cubs under her wing and raised them as her own children. The researchers that were observing all of this had no idea what to make of it. Maybe the lion felt bad for eating their mother in the first place.