" At the workshop, he presented his view on consciousness: that it has to be part and parcel of all cognitive processes, including those of animals. My own position is slightly different in that I prefer not to make any firm statements about something as poorly defined as consciousness. No one seems to know what it is. But for the same reason, I hasten to add, I’d never deny it to any species. For all I know, a frog may be conscious. Griffin took a more positive stance, saying that since intentional, intelligent actions are observable in many animals, and since in our own species they go together with awareness, it is reasonable to assume similar mental states in other species. "

― Frans de Waal , Are We Smart Enough to Know How Smart Animals Are?