If an organism can make a choice, it's conscious. It's just by degree and sophistication that separates different hierarchies of organisms; it's not a present/not present phenomenon. from what I've read, this ability goes down to worms albeit extremely primitively. This is interesting about ants:
If ants have the possible ability of self-recognition, it would seem reasonable to surmise they have some level of consciousness imo.
It is only "uniquely human" if we define it by criteria which only humans can attain.