We look at animals and wonder what it's like to be led blind by instincts; what degree of consciousness they must have - and even use our guesses to justify harming them.
Yet with ourselves it is not much different. We believe ourselves to have free will, but how many of us truly lead our lives with true conviction and deliberate, free movement every moment? We are just as blinded by our instincts for pleasure, languor and fear as the crabs are in their migrations to the ocean to release their eggs. The latter is clearly not done out of rational thought, but neither is much of what we do throughout our entire lives.