Human
Humans on Earth are members of One Large Family because they originally evolved from the Six Animal Evolutionary Cycles to attain the human cycle.
The earliest ancestors of humans, the primitive men, were from the ape family in the animal cycle.
From moving on all fours, they developed the ability to stand upright to walk, and that was the beginning of the human world.
As primitive men had just reached humanhood from animalhood, it was not possible to shed all their animal characters such as, fierceness, cruelty, savagery and brutality. The strong bullied the weak, the big bullied the small.
After so many lifetimes this animal trait still exist in human character until today. Why?