Climb high on a mountain near the snow line and you find beautiful wild flowers, but walking back down as things become drier, you will notice more and more weeds.
Continue your decent into the desert, and the vegetation becomes even more noxious, plants are poisonous, and covered with thorns.
The same with the critters, only the horned, the hard shelled, and the poisonous can survive the lack of moisture, and the scarcity of food.
Google ‘images of unlikely friendships,’ and you will see that in a safe environment with an abundance of food animals get along.
It takes harsh conditions, and near starvation for animals to begin to kill and eat one another.
In fact all animals were still vegetarians on Noah’s ark.
God didn’t tell Noah to bring along extra bunnies to feed the tigers.