The start is the requirement for a really smart brain, so it would need to be an omnivore or a non-specialist carnivore. The more types of food they eat the more likely there is a requirement for the brain to develop a special hunting technique or a method of harvesting the food and judging the ripeness etc. On top of that would be a need for social interaction with others of the same species and a method of communication and detecting mood changes in others.
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