The followers of one of the biggest world religions, the Hinduism, have one very interesting and unique trait among the big religions. They consider an animal as a sacred being, that animal being the cow. Because the cow is considered as sacred, it enjoys a high status in the Hindu societies, and no one is allowed to kill or milk the cows. If someone actually tries to harm a cow, that person will either end up heavily beaten up or maybe even be killed.
Because the cows in India roam freely, and no one is doing any harm to them, nor exploits them, the cows have reached such a high number that India actually has the biggest cow population in the world.
A push factor would be something like war or famine or something. A pull factor would be something like a job or new opportunity, its usually for financial reasons in my opinion. Hope this helped!
