Affiliate Marketing Secrets

I am doing an assignment for my psychology class.
It is about the development of the personality due to social niches.
In simplified terms, when an animal asserts a certain role, others will look for a different role they are good at which leads to the development of a variety of personalities.
Animals occupy the same niche, they automatically fill different roles to avoid competition and be recognized. This is what is behind social niche personality specialization.
Do you think animals or humans have more environmental constraints?