2/2
And so was more likely to be happening when the next food arrived. But somewhere things got supercharged and when the pidgeon expected the reward for the movement but only got the food sometimes then the behavior (putting head under left wing, turning in circle to right, hopping on left foot) became heavily entrenched, well learnt.
Dear Elon's beliefs about women, fascists, competition and what it is to be human can, at least in part, be understood as the products of a random reward system.